Straight Hose Coupler 3.75in I.D. x 3.00in L

The Straight Hose Coupler 3.75in I.D. x 3.00in L from Vibrant Performance is a precision-engineered intake and coolant hose connector built for custom automotive plumbing applications. Whether you're fabricating a high-performance intake manifold, designing a custom cooling loop, or upgrading intercooler piping on a turbocharged build, this coupler provides reliable, leak-free connections without the bulk of traditional clamps or adapters. Mechanics and fabricators rely on Vibrant Performance couplers to maintain tight tolerances and clean engine bay aesthetics on street rods, race cars, and modified daily drivers.

This straight coupler features a 3.75-inch inner diameter (I.D.) with a compact 3.00-inch length, making it ideal for tight engine compartment layouts where space is at a premium. The design accommodates standard-wall and thin-wall silicone hoses, creating a mechanical interference fit that eliminates the need for hose clamps in many applications—reducing vibration transfer and simplifying disassembly during maintenance. Vibrant's manufacturing tolerances ensure concentric bore alignment, critical for maintaining boost pressure in forced-induction systems and preventing coolant seepage in high-temperature circuits. The lightweight construction at just 0.4 lbs contributes to overall weight savings on dedicated track vehicles.

This coupler suits fabricators working on LS conversions, turbo intake manifold modifications, and custom radiator and heater hose routing where OEM plumbing won't fit the new configuration. It's equally popular in water-cooled intercooler setups, where the straight profile minimizes turbulence and pressure drop compared to 90-degree fittings. Installation is straightforward—slide hoses over both ends and secure with clamps if additional security is desired, or rely on the interference fit for temporary test-fit applications. Always verify hose wall thickness and inner diameter compatibility before purchase to ensure a secure, properly sealed connection in your specific cooling or intake system.