System1 Designs 2.5" to 1.75" Inch Black Elbow Silicone Reducer Coupler 3 Layers of Polyester Reinforcement Suitable High Quality 45 Degree Turbo Intake Pipe 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. Features: 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 428F for direct to turbocharger installations. Size: 2.5" to 1.75" Length: 3.5" Material: 3-ply Polyester Reinforced Temp: 428 Degrees F (220 C)