Flexfab 5515-600X12, 6.00" x 12 ft, 3-Ply Blue Silicone Coolant Hose, 152mm

A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems, the Flexfab 5515-600X12 is a 3-ply blue silicone hose built to resist hardening, cracking, cold leaks, and aging where ordinary rubber fails.

Why this Flexfab 3-ply coolant hose

• 3-ply polyester reinforcement — 75 PSI actual burst, a wide margin over the ~25 PSI working pressure of most cooling systems.
• −65°F to +350°F range — stays flexible in cold and handles under-hood heat without going brittle.
• Meets SAE J20 R1 Class A & TMC RP303B Class I Grade II — documented spec-grade performance.
• 6.00" (152mm) ID × 6.32" (161mm) OD — precise sizing for a clean clamp seal.
• Resists oil splash, ozone, and direct sunlight — long service life in hostile engine environments.

Cut to a 12-foot stick, ready to install, and pairs with a Flexfab 2584-0662 clamp for a leak-free connection.

Backed by hpcouplers’ fast shipping and easy returns.

• FlexFab Series: 5515
• Part Number: 5515-600X12
• Inside Diameter (ID): 6.00" (152mm)
• Outside Diameter (OD): 6.32" (161mm)
• Hose Length: 12 feet
• Wall Thickness: .140" / .190"
• Weight LB/FT: 1.92
• Actual Burst Pressure - PSI: 75
• SAE J20 R1 Class A - PSI: N/A
• TMC RP303B Class I Grade II - PSI: N/A
• Extreme temp range: -65F to +350F
• Construction: Blue Silicone hose with 3-ply of Polyester reinforcement