System1 Designs 2.5" to 2.25" Inch Black Silicone Reducer Coupler 3 Layers of Polyester Reinforcement Suitable Turbo Air Intake Intercooler Piping with 2x T-Bolt Clamps System1 Designs line of silicone couplers feature 3 layers of polyester reinforcement and are suitable for applications with boost pressures up to 45psi. They also feature a temperature rating of 428°F for direct to turbocharger installations. Dont be fooled by cheap 4-ply couplers, sellers generally use it as a marketing term to mean quality which is often not the case. Our 3-ply meet rigorous standards and have been field tested time and time again. Features: Coupler Size: 2.5 to 2.25 inches Temperature: 428 Degrees F (220 C). 3-ply Polyester Reinforced. Includes 2 T-bolt clamps Perfect for air intake, intercooler piping and other turbo applications.