Flexfab 5934-112x50, 1-1/8" ID x 50 ft Box Premium Blue Silicone Heater Hose, 29mm 350F Radiator Coolant

Get premium heater-hose performance in a larger 1-1/8" bore with the Flexfab 5934-112x50 silicone heater hose — a 50-foot box engineered for higher pressure handling than standard heater hose. Its silicone construction resists hardening, cracking, cold leaks, aging, and coolant-additive attack for dependable long-term sealing.

Why this Flexfab premium heater hose

• Thicker wall for higher pressure — 250 PSI burst rating gives a wide margin over the ~83 PSI working pressure of heater circuits.
• Silicone with 1-ply reinforcement — superior flexibility and premium durability, extreme-duty-cycle tested for hostile engine bays.
• −65°F to +350°F range — holds up to under-hood heat and winter cold without going brittle or soft.
• Meets SAE J20 R3 Class A & TMC RP303B Class I Grade II — documented premium heater-hose spec.
• 1-1/8" (29mm) ID × 1.52" (38mm) OD, bend radius 5× ID — tight, kink-free routing.

Supplied as a continuous 50-foot box, ideal for larger heater core, radiator, and coolant runs. Pairs with a Flexfab 2582-0020 clamp. (Silicone heater hose is for coolant/heater use — not fuel.)

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

• FlexFab Series: 5934
• Part Number: 5934-112x50
• Inside Diameter (ID): 1.125" (29mm)
• Outside Diameter (OD): 1.52" (38mm)
• Overall Length: 50 feet (Box)
• Weight LB/FT: 0.438
• Actual Burst Pressure - PSI: 250
• SAE J20 R3 Class A - PSI: 275
• TMC RP303B Class I Grade II - PSI: 125
• Bend Radius: 5x ID
• Extreme temp range: -65F to +350F
• Construction: Blue Silicone premium heater hose with 1-ply reinforcement