Squirrelly 4" to 3" Inch Elbow Black Silicone Reducer Coupler 3 Layers Polyester Reinforcement Suitable High Level 45 Degree Turbo Intake Pipe Squirrelly's 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: Squirrelly's 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: 4" to 3" Length: 3.5" Material: 3-ply Polyester Reinforced Temp: 428 Degrees F (220 C)