Reducer Coupler 3in I.D. to 2.75in I.D. x 4.5in L

The Reducer Coupler 3in I.D. to 2.75in I.D. x 4.5in L by Vibrant Performance is a precision tubing adapter engineered for high-performance cooling and fuel system applications. This straight reducer coupler transitions between two different internal diameter sizes, making it essential for custom engine builds, turbo cooling loops, and aftermarket plumbing configurations where stock hose diameters don't align with performance upgrades. Whether you're upgrading intercooler piping, installing a larger radiator circuit, or adapting OEM components to high-flow aftermarket systems, this coupler provides the reliable step-down connection your build requires.

Manufactured from durable silicone with 0.200-inch thick walls, this reducer coupler delivers superior heat resistance and flexibility compared to rigid metal adapters. The 4.5-inch length provides adequate material for secure clamping while remaining compact enough to fit in tight engine bay configurations. Vibrant Performance's proprietary silicone compound resists degradation from coolant additives, fuel contact, and thermal cycling—critical factors for longevity in underhood environments where temperatures regularly exceed 200°F. The black finish coordinates seamlessly with modern engine detailing while the smooth interior bore minimizes turbulence and maintains efficient flow dynamics across the transition zone.

Enthusiasts restoring or upgrading vehicles with non-standard tubing diameters benefit most from this versatile coupler. Installation requires standard stainless steel hose clamps at both the 3-inch and 2.75-inch inlet/outlet ends—ensure clamps are tightened evenly to prevent leakage and promote even wall compression. This product integrates seamlessly into any custom cooling or fuel system where diameter reduction is necessary, from street rods and restomod projects to modern performance vehicles requiring specialized plumbing layouts. The lightweight design (0.26 lbs) adds negligible weight while the compact 4.5-inch length makes it ideal for space-constrained installations.