{"title":"Flexfab 5581 Blue 4-Ply Coolant Hose","description":"\u003cp\u003eThe Flexfab 5581 series is 4-ply blue silicone coolant hose, with an extra ply for added strength in high-pressure and large-diameter cooling applications.\u003c\/p\u003e","products":[{"product_id":"flexfab-5581-038-0-38-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-038, 0.38\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 10mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-038\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 600 PSI actual burst rating, which means a wide safety margin at the ~200 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.38\" (10mm) ID × 0.77\" (20mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0006 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-038\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.38\" (10mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 0.77\" (20mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457647468591,"sku":"FLEX 5581-038 (3) v1.0","price":38.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-038x12-0-38-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-038X12, 0.38\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 10mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-038X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 600 PSI actual burst rating, which means a wide safety margin at the ~200 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.38\" (10mm) ID × 0.77\" (20mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0006 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-038X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.38\" (10mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 0.77\" (20mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457647599663,"sku":"FLEX 5581-038X12 (12) v1.0","price":154.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-050-0-50-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-050, 0.50\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 13mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-050\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 600 PSI actual burst rating, which means a wide safety margin at the ~200 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.50\" (13mm) ID × 0.89\" (23mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0008 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-050\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.50\" (13mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 0.89\" (23mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457647763503,"sku":"FLEX 5581-050 (3) v1.0","price":39.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-050x12-0-50-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-050X12, 0.50\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 13mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-050X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 600 PSI actual burst rating, which means a wide safety margin at the ~200 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.50\" (13mm) ID × 0.89\" (23mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0008 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-050X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.50\" (13mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 0.89\" (23mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 600\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457647894575,"sku":"FLEX 5581-050X12 (12) v1.0","price":159.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-062-0-63-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-062, 0.63\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 16mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-062\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 585 PSI actual burst rating, which means a wide safety margin at the ~195 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.63\" (16mm) ID × 1.02\" (26mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0010 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-062\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.63\" (16mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.02\" (26mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.24\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 585\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648025647,"sku":"FLEX 5581-062 (3) v1.0","price":41.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-062x12-0-63-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-062X12, 0.63\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 16mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-062X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 585 PSI actual burst rating, which means a wide safety margin at the ~195 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.63\" (16mm) ID × 1.02\" (26mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0010 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-062X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.63\" (16mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.02\" (26mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.24\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 585\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 425 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648189487,"sku":"FLEX 5581-062X12 (12) v1.0","price":166.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-075-0-75-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-075, 0.75\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 19mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-075\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 575 PSI actual burst rating, which means a wide safety margin at the ~192 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.75\" (19mm) ID × 1.14\" (29mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0012 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-075\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.75\" (19mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.14\" (29mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.29\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 575\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 325 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648320559,"sku":"FLEX 5581-075 (3) v1.0","price":43.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-075x12-0-75-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-075X12, 0.75\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 19mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-075X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 575 PSI actual burst rating, which means a wide safety margin at the ~192 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.75\" (19mm) ID × 1.14\" (29mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0012 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-075X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.75\" (19mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.14\" (29mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.29\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 575\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 325 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648484399,"sku":"FLEX 5581-075X12 (12) v1.0","price":173.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-087-0-88-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-087, 0.88\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 22mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-087\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 560 PSI actual burst rating, which means a wide safety margin at the ~187 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.88\" (22mm) ID × 1.27\" (32mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0016 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-087\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.88\" (22mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.27\" (32mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 560\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648681007,"sku":"FLEX 5581-087 (3) v1.0","price":50.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-087x12-0-88-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-087X12, 0.88\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 22mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-087X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 0.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 560 PSI actual burst rating, which means a wide safety margin at the ~187 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.88\" (22mm) ID × 1.27\" (32mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0016 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-087X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 0.88\" (22mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.27\" (32mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.34\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 560\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457648844847,"sku":"FLEX 5581-087X12 (12) v1.0","price":203.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-100-1-00-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-100, 1.00\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 25mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-100\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 550 PSI actual burst rating, which means a wide safety margin at the ~183 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.00\" (25mm) ID × 1.39\" (35mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0016 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.00\" (25mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.39\" (35mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.39\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 550\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457649172527,"sku":"FLEX 5581-100 (3) v1.0","price":55.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-100x12-1-00-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-100X12, 1.00\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 25mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-100X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 550 PSI actual burst rating, which means a wide safety margin at the ~183 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.00\" (25mm) ID × 1.39\" (35mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0016 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-100X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.00\" (25mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.39\" (35mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.39\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 550\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457649336367,"sku":"FLEX 5581-100X12 (12) v1.0","price":222.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-112-1-13-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-112, 1.13\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 29mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-112\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 525 PSI actual burst rating, which means a wide safety margin at the ~175 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.13\" (29mm) ID × 1.52\" (39mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0020 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-112\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.13\" (29mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.52\" (39mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.44\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 525\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457649467439,"sku":"FLEX 5581-112 (3) v1.0","price":58.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-112x12-1-13-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-112X12, 1.13\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 29mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-112X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 525 PSI actual burst rating, which means a wide safety margin at the ~175 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.13\" (29mm) ID × 1.52\" (39mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0020 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-112X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.13\" (29mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.52\" (39mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.44\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 525\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 300 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457649598511,"sku":"FLEX 5581-112X12 (12) v1.0","price":236.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-125-1-25-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-125, 1.25\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 32mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-125\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 500 PSI actual burst rating, which means a wide safety margin at the ~167 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" (32mm) ID × 1.64\" (42mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0020 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.25\" (32mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.64\" (42mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.49\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 275 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457649729583,"sku":"FLEX 5581-125 (3) v1.0","price":61.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-125x12-1-25-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-125X12, 1.25\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 32mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-125X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 500 PSI actual burst rating, which means a wide safety margin at the ~167 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" (32mm) ID × 1.64\" (42mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0020 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-125X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.25\" (32mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.64\" (42mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.49\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 275 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457650188335,"sku":"FLEX 5581-125X12 (12) v1.0","price":246.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-138-1-38-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-138, 1.38\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 35mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-138\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 475 PSI actual burst rating, which means a wide safety margin at the ~158 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.38\" (35mm) ID × 1.77\" (45mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0024 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-138\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.38\" (35mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.77\" (45mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.54\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 475\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 250 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457650286639,"sku":"FLEX 5581-138 (3) v1.0","price":64.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-138x12-1-38-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-138X12, 1.38\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 35mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-138X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 475 PSI actual burst rating, which means a wide safety margin at the ~158 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.38\" (35mm) ID × 1.77\" (45mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0024 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-138X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.38\" (35mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.77\" (45mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.54\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 475\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 250 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457650810927,"sku":"FLEX 5581-138X12 (12) v1.0","price":259.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-150-1-50-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-150, 1.50\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 38mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-150\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 450 PSI actual burst rating, which means a wide safety margin at the ~150 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.50\" (38mm) ID × 1.89\" (48mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0024 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.50\" (38mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.89\" (48mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.59\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 450\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 250 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457650909231,"sku":"FLEX 5581-150 (3) v1.0","price":68.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-150x12-1-50-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-150X12, 1.50\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 38mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-150X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 450 PSI actual burst rating, which means a wide safety margin at the ~150 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.50\" (38mm) ID × 1.89\" (48mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0024 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-150X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.50\" (38mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 1.89\" (48mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.59\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 450\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 250 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651073071,"sku":"FLEX 5581-150X12 (12) v1.0","price":272.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-162-1-63-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-162, 1.63\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 41mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-162\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 425 PSI actual burst rating, which means a wide safety margin at the ~142 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.63\" (41mm) ID × 2.02\" (51mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0028 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-162\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.63\" (41mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.02\" (51mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.63\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 425\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 225 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651204143,"sku":"FLEX 5581-162 (3) v1.0","price":70.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-162x12-1-63-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-162X12, 1.63\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 41mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-162X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 425 PSI actual burst rating, which means a wide safety margin at the ~142 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.63\" (41mm) ID × 2.02\" (51mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0028 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-162X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.63\" (41mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.02\" (51mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.63\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 425\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 225 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651335215,"sku":"FLEX 5581-162X12 (12) v1.0","price":284.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-175-1-75-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-175, 1.75\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 44mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-175\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75\" (44mm) ID × 2.14\" (54mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0028 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-175\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.75\" (44mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.14\" (54mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.68\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 225 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651499055,"sku":"FLEX 5581-175 (3) v1.0","price":75.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-175x12-1-75-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-175X12, 1.75\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 44mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-175X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75\" (44mm) ID × 2.14\" (54mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0028 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-175X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.75\" (44mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.14\" (54mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.68\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 225 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651630127,"sku":"FLEX 5581-175X12 (12) v1.0","price":300.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-187-1-88-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-187, 1.88\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 48mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-187\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.88\" (48mm) ID × 2.27\" (58mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0032 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-187\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.88\" (48mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.27\" (58mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.73\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 200 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651793967,"sku":"FLEX 5581-187 (3) v1.0","price":81.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-187x12-1-88-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-187X12, 1.88\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 48mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-187X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 1.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.88\" (48mm) ID × 2.27\" (58mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0032 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-187X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 1.88\" (48mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.27\" (58mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.73\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 200 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457651925039,"sku":"FLEX 5581-187X12 (12) v1.0","price":328.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-200-2-00-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-200, 2.00\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 51mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-200\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.00\" (51mm) ID × 2.39\" (61mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0032 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.00\" (51mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.39\" (61mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.78\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 200 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652056111,"sku":"FLEX 5581-200 (3) v1.0","price":82.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-200x12-2-00-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-200X12, 2.00\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 51mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-200X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 400 PSI actual burst rating, which means a wide safety margin at the ~133 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.00\" (51mm) ID × 2.39\" (61mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0032 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-200X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.00\" (51mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.39\" (61mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.78\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 400\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 200 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652187183,"sku":"FLEX 5581-200X12 (12) v1.0","price":331.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-212-2-13-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-212, 2.13\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 54mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-212\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 375 PSI actual burst rating, which means a wide safety margin at the ~125 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.13\" (54mm) ID × 2.52\" (64mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0036 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-212\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.13\" (54mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.52\" (64mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.83\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 375\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652318255,"sku":"FLEX 5581-212 (3) v1.0","price":77.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-212x12-2-13-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-212X12, 2.13\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 54mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-212X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 375 PSI actual burst rating, which means a wide safety margin at the ~125 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.13\" (54mm) ID × 2.52\" (64mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0036 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-212X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.13\" (54mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.52\" (64mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.83\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 375\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652449327,"sku":"FLEX 5581-212X12 (12) v1.0","price":308.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-225-2-25-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-225, 2.25\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 57mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-225\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 350 PSI actual burst rating, which means a wide safety margin at the ~117 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.25\" (57mm) ID × 2.64\" (67mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0036 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-225\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.25\" (57mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.64\" (67mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.88\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 350\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652580399,"sku":"FLEX 5581-225 (3) v1.0","price":92.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-225x12-2-25-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-225X12, 2.25\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 57mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-225X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 350 PSI actual burst rating, which means a wide safety margin at the ~117 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.25\" (57mm) ID × 2.64\" (67mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0036 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-225X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.25\" (57mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.64\" (67mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.88\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 350\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652678703,"sku":"FLEX 5581-225X12 (12) v1.0","price":371.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-238-2-38-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-238, 2.38\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 60mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-238\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 325 PSI actual burst rating, which means a wide safety margin at the ~108 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.38\" (60mm) ID × 2.77\" (70mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0040 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-238\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.38\" (60mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.77\" (70mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.93\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 325\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 150 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652777007,"sku":"FLEX 5581-238 (3) v1.0","price":93.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-238x12-2-38-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-238X12, 2.38\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 60mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-238X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 325 PSI actual burst rating, which means a wide safety margin at the ~108 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.38\" (60mm) ID × 2.77\" (70mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0040 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-238X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.38\" (60mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.77\" (70mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.93\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 325\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 150 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652809775,"sku":"FLEX 5581-238X12 (12) v1.0","price":373.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-250-2-50-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-250, 2.50\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 64mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-250\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 300 PSI actual burst rating, which means a wide safety margin at the ~100 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.50\" (64mm) ID × 2.89\" (73mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0040 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.50\" (64mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.89\" (73mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.98\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 150 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652875311,"sku":"FLEX 5581-250 (3) v1.0","price":96.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-250x12-2-50-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-250X12, 2.50\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 64mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-250X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.50\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 300 PSI actual burst rating, which means a wide safety margin at the ~100 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.50\" (64mm) ID × 2.89\" (73mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0040 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-250X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.50\" (64mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 2.89\" (73mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 0.98\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 150 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457652973615,"sku":"FLEX 5581-250X12 (12) v1.0","price":387.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-262-2-63-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-262, 2.63\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 67mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-262\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 285 PSI actual burst rating, which means a wide safety margin at the ~95 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.63\" (67mm) ID × 3.02\" (77mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0044 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-262\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.63\" (67mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.02\" (77mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.02\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 285\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653137455,"sku":"FLEX 5581-262 (3) v1.0","price":78.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-262x12-2-63-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-262X12, 2.63\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 67mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-262X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.63\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 285 PSI actual burst rating, which means a wide safety margin at the ~95 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.63\" (67mm) ID × 3.02\" (77mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0044 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-262X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.63\" (67mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.02\" (77mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.02\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 285\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653235759,"sku":"FLEX 5581-262X12 (12) v1.0","price":312.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-275-2-75-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-275, 2.75\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 70mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-275\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 275 PSI actual burst rating, which means a wide safety margin at the ~92 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.75\" (70mm) ID × 3.14\" (80mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0044 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-275\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.75\" (70mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.14\" (80mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.07\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 275\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653366831,"sku":"FLEX 5581-275 (3) v1.0","price":104.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-275x12-2-75-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-275X12, 2.75\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 70mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-275X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.75\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 275 PSI actual burst rating, which means a wide safety margin at the ~92 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.75\" (70mm) ID × 3.14\" (80mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0044 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-275X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.75\" (70mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.14\" (80mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.07\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 275\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 125 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653596207,"sku":"FLEX 5581-275X12 (12) v1.0","price":419.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-287-2-88-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-287, 2.88\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 73mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-287\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 250 PSI actual burst rating, which means a wide safety margin at the ~83 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.88\" (73mm) ID × 3.27\" (83mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0048 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-287\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.88\" (73mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.27\" (83mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653792815,"sku":"FLEX 5581-287 (3) v1.0","price":97.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-287x12-2-88-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-287X12, 2.88\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 73mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-287X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 2.88\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 250 PSI actual burst rating, which means a wide safety margin at the ~83 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.88\" (73mm) ID × 3.27\" (83mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0048 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-287X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 2.88\" (73mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.27\" (83mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457653956655,"sku":"FLEX 5581-287X12 (12) v1.0","price":391.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-300-3-00-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-300, 3.00\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 76mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-300\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 250 PSI actual burst rating, which means a wide safety margin at the ~83 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.00\" (76mm) ID × 3.39\" (86mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0048 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.00\" (76mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.39\" (86mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.17\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457654120495,"sku":"FLEX 5581-300 (3) v1.0","price":116.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-300x12-3-00-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-300X12, 3.00\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 76mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-300X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.00\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 250 PSI actual burst rating, which means a wide safety margin at the ~83 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.00\" (76mm) ID × 3.39\" (86mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0048 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-300X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.00\" (76mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.39\" (86mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.17\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457654317103,"sku":"FLEX 5581-300X12 (12) v1.0","price":464.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-312-3-13-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-312, 3.13\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 80mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-312\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 225 PSI actual burst rating, which means a wide safety margin at the ~75 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.13\" (80mm) ID × 3.52\" (89mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0052 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-312\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.13\" (80mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.52\" (89mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 225\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457654480943,"sku":"FLEX 5581-312 (3) v1.0","price":93.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-312x12-3-13-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-312X12, 3.13\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 80mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-312X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.13\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 225 PSI actual burst rating, which means a wide safety margin at the ~75 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.13\" (80mm) ID × 3.52\" (89mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0052 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-312X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.13\" (80mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.52\" (89mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.22\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 225\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457654677551,"sku":"FLEX 5581-312X12 (12) v1.0","price":374.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-325-3-25-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-325, 3.25\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 83mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-325\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 225 PSI actual burst rating, which means a wide safety margin at the ~75 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.25\" (83mm) ID × 3.64\" (92mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0052 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-325\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.25\" (83mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.64\" (92mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.27\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 225\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457654841391,"sku":"FLEX 5581-325 (3) v1.0","price":119.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-325x12-3-25-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-325X12, 3.25\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 83mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-325X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.25\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 225 PSI actual burst rating, which means a wide safety margin at the ~75 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.25\" (83mm) ID × 3.64\" (92mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0052 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-325X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.25\" (83mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.64\" (92mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.27\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 225\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457655037999,"sku":"FLEX 5581-325X12 (12) v1.0","price":479.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-338-3-38-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-338, 3.38\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 86mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-338\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 200 PSI actual burst rating, which means a wide safety margin at the ~67 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.38\" (86mm) ID × 3.77\" (96mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 3-foot stick and ready to install, this hose pairs with a Flexfab 2582-0056 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-338\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.38\" (86mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.77\" (96mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 3 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.32\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457655201839,"sku":"FLEX 5581-338 (3) v1.0","price":112.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"},{"product_id":"flexfab-5581-338x12-3-38-x-12-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-338X12, 3.38\" x 12 ft, 4-Ply Blue Silicone Coolant Hose, 86mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-338X12\u003c\/strong\u003e 4-ply silicone coolant hose. A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems — including city transit, school buses, and refuse fleets — this 3.38\" ID hose resists the hardening, cracking, and aging that cut the life of ordinary rubber hose — so you replace it less and trust it more.\u003c\/p\u003e\n\u003ch2\u003eWhy this Flexfab 4-ply coolant hose\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ply polyester reinforcement\u003c\/strong\u003e — delivers a 200 PSI actual burst rating, which means a wide safety margin at the ~67 PSI working pressure of most cooling systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e−65°F to +350°F range\u003c\/strong\u003e — silicone construction stays flexible in winter cold and holds up to under-hood heat, so it won’t go brittle or soften.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeets SAE J20 R1 Class A \u0026amp; TMC RP303B Class I Grade II\u003c\/strong\u003e — spec-grade performance fleets can document and rely on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.38\" (86mm) ID × 3.77\" (96mm) OD\u003c\/strong\u003e, .170\"\/.220\" wall — precise sizing for a clean clamp seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResists oil splash, ozone, and direct sunlight\u003c\/strong\u003e — engineered for long service life in hostile engine environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCut to a 12-foot stick and ready to install, this hose pairs with a Flexfab 2582-0056 clamp for a leak-free connection that handles repeated heat cycles without loosening.\u003c\/p\u003e\n\u003cp\u003eBacked by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexFab Series\u003c\/strong\u003e: 5581\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: 5581-338X12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 3.38\" (86mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 3.77\" (96mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHose Length\u003c\/strong\u003e: 12 feet\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall Thickness\u003c\/strong\u003e: .170\" \/ .220\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight LB\/FT\u003c\/strong\u003e: 1.32\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: 75 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: 100 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtreme temp range\u003c\/strong\u003e: -65F to +350F\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction\u003c\/strong\u003e: Blue Silicone hose with 4-ply of Polyester reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flexfab","offers":[{"title":"Default Title","offer_id":45457655300143,"sku":"FLEX 5581-338X12 (12) v1.0","price":448.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/9849\/files\/Flexfab_Stock_image_v1_06.10.26.png?v=1781140351"}],"url":"https:\/\/www.hpcouplers.com\/en-ie\/collections\/flexfab-5581-blue-4-ply-coolant-hose.oembed?page=3","provider":"hpcouplers","version":"1.0","type":"link"}