Vibrant Performance 2837 4-Ply Silicone Reducer Coupling, 4-Inch to 4-1/2-Inch ID, 3-Inch Length

The Vibrant Performance 2837 4-Ply Reducer Coupling is designed to connect tubing with different inside diameters in air intake, intercooler, turbocharger, and other high-performance plumbing applications. This straight reducer coupler transitions from a 4-inch inside diameter to a 4-1/2-inch inside diameter, providing a secure connection between mismatched tubing sizes while supporting reliable airflow and system performance.
Constructed from reinforced silicone, the coupling offers durable flexibility and resistance to heat, pressure, and common automotive fluids. Its four-ply design adds strength and dimensional stability compared with standard single-layer couplers, helping reduce the risk of collapse, splitting, or deformation in demanding engine-bay environments. The black finish provides a clean, professional appearance suitable for custom and replacement installations.
The compact 3-inch-long design allows for practical placement where space is limited and simplifies alignment between connected tubes. Use the Vibrant Performance 2837 as a dependable reducer connection for custom fabrication, performance upgrades, or replacement of worn or damaged tubing couplers. The coupler is supplied individually and is not subject to air-shipping restrictions or truck-freight-only requirements.

Features:

• Brand: Vibrant Performance

• Part Number: 2837

• Coupler Type: Straight reducer coupling

• Size Transition: Connects 4-inch and 4-1/2-inch inside diameter tubing

• Construction: Reinforced four-ply silicone

• Color: Black

• Application: Suitable for air intake, intercooler, turbocharger, and custom tubing systems

• Package Contents: One tubing coupler