{"product_id":"flexfab-5581-450-4-50-x-3-ft-4-ply-blue-silicone-coolant-hose","title":"Flexfab 5581-450, 4.50\" x 3 ft, 4-Ply Blue Silicone Coolant Hose, 114mm","description":"\u003cp\u003eKeep your cooling system sealed and reliable in the harshest engine bays with the \u003cstrong\u003eFlexfab 5581-450\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 4.50\" 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 150 PSI actual burst rating, which means a wide safety margin at the ~50 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\u003e4.50\" (114mm) ID × 4.89\" (124mm) 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 2582-0072 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: 5581-450\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter (ID)\u003c\/strong\u003e: 4.50\" (114mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Diameter (OD)\u003c\/strong\u003e: 4.89\" (124mm)\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: 1.76\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual Burst Pressure - PSI\u003c\/strong\u003e: 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE J20 R1 Class A - PSI\u003c\/strong\u003e: N\/A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTMC RP303B Class I Grade II - PSI\u003c\/strong\u003e: N\/A\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":45457656381487,"sku":"FLEX 5581-450 (3) v1.0","price":138.95,"currency_code":"EUR","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\/products\/flexfab-5581-450-4-50-x-3-ft-4-ply-blue-silicone-coolant-hose","provider":"hpcouplers","version":"1.0","type":"link"}