Flexfab 7903-300400, 3.00" to 4.00" ID Silicone Reducer, Blue Coolant / Charge Air, 6.00" OAL

Step cleanly between two pipe sizes with the Flexfab 7903-300400 silicone reducer. Its 4-ply meta-aramid construction handles the heat and boost pressure of coolant and charge-air systems alike — a dual-purpose reducer that holds shape and seals tight on both ends.

Why this Flexfab silicone reducer

• Dual-purpose design — works as a coolant hose or a charge-air connector, so one reducer covers two jobs.
• 4-ply meta-aramid reinforcement — high pressure and temperature resistance for hostile engine environments.
• −65°F to +500°F range — resists hardening, cracking, cold leaks, aging, and chemicals.
• Meets SAE J20 R1 Class A & TMC RP303B Class I Grade II — documented spec-grade performance.
• 3.00" to 4.00" ID step, 6.00" OAL, .170"/.220" wall — sized for a clean clamp seal on each end.

Pair with appropriate clamps on each end for a secure, leak-free connection between mismatched pipe sizes.

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

• FlexFab Series: 7903
• Part Number: 7903-300400
• Inside Diameter (ID): 3.00" to 4.00" (reducing)
• Overall Length: 6.00"
• Wall Thickness: .170" / .220"
• SAE J20 R1 Class A: Yes
• TMC RP303B Class I Grade II: Yes
• Extreme temp range: -65F to +500F
• Construction: Blue silicone hose with 4-ply meta-aramid reinforcement