System1 Designs 3" Inch Black Silicone Coupler 3 Layers of Polyester Reinforcement Suitable with 2x T-Bolt Clamps Soft Hose Air Intake Intercooler Piping 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: 3 inches. 180 Degree Bend. 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.