Flexfab 5508-300, 3.00" x 3 ft, Wire Reinforced Silicone Coolant Hose, 76mm

Hold a tight, leak-free seal even under vacuum and forced bends with the Flexfab 5508-300 wire-reinforced silicone coolant hose. A helical wire embedded in the wall lets this 3.00" ID hose route around obstacles and resist collapse on the suction side — built for heavy-duty coolant and vacuum connections across diesel, automotive, marine, agricultural, and industrial cooling systems.

Why this Flexfab wire-reinforced coolant hose

• Helical wire construction — withstands up to 10 PSI negative (vacuum) pressure and allows forced curvature, which means it routes tight bends without kinking or collapsing.
• 2-ply polyester reinforcement — 300 PSI actual burst rating gives a wide margin over the ~100 PSI working pressure of most cooling systems.
• −65°F to +350°F range — silicone stays flexible in cold and holds up to under-hood heat without hardening or cracking.
• Meets SAE J20 R2 Class A — spec-grade heavy-duty coolant hose performance.
• 3.00" (76mm) ID × 3.42" (87mm) OD, 7.0" min bend radius — sized for demanding routing.

Supplied as a 3-foot stick, this hose suits turbo, intake, and coolant runs where ordinary hose would collapse under suction.

Backed by hpcouplers’ fast shipping and easy returns — order with confidence from a trusted industrial hose and coupler supplier.

• FlexFab Series: 5508
• Part Number: 5508-300
• Inside Diameter (ID): 3.00" (76mm)
• Outside Diameter (OD): 3.42" (87mm)
• Hose Length: 3 feet
• Wall Thickness: .130" / .180" (exclusive of wire gauge)
• Bend Radius: 7.0"
• Weight LB/FT: 0.85
• Actual Burst Pressure - PSI: 300
• Max Negative Pressure - PSI: -10
• SAE J20 R2 Class A: Yes
• Extreme temp range: -65F to +350F
• Construction: Green Silicone hose, 2-ply polyester with helical wire reinforcement