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Flexfab KIT5003D heater hose repair kit hose and clamp kit

Flexfab 5500-325, 3.25" x 3 ft, 3-Ply Green Silicone Coolant Hose, 83mm

by Flexfab
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$ 2,404.00
$ 2,404.00 - $ 2,404.00
$ 2,404.00
$ 1,923.00
$ 1,923.00 - $ 1,923.00
$ 1,923.00

A versatile heavy-duty coolant hose for diesel, automotive, marine, agricultural, and industrial cooling systems, the Flexfab 5500-325 is a 3-ply green 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 — 175 PSI actual burst, a wide margin over the ~58 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.
  • 3.25" (83mm) ID × 3.57" (91mm) 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 3-foot stick, ready to install, and pairs with a Flexfab 2582-0052 clamp for a leak-free connection.

Backed by hpcouplers’ fast shipping and easy returns.

  • FlexFab Series: 5500
  • Part Number: 5500-325
  • Inside Diameter (ID): 3.25" (83mm)
  • Outside Diameter (OD): 3.57" (91mm)
  • Hose Length: 3 feet
  • Wall Thickness: .140" / .190"
  • Weight LB/FT: 1.04
  • Actual Burst Pressure - PSI: 175
  • SAE J20 R1 Class A - PSI: 75 PSI
  • TMC RP303B Class I Grade II - PSI: 100 PSI
  • Extreme temp range: -65F to +350F
  • Construction: Green Silicone hose with 3-ply of Polyester reinforcement