System1 Designs 3" Inch Black Straight Silicone Coupler 3 Layers of Polyester Reinforcement Suitable Pipe Intake Turbo Intercooler 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. Features: Coupler Size: 3 inches Coupler Length: 3" inches Temperature: 428 Degrees F (220 C). 3-ply Polyester Reinforced. Includes 2 T-bolt clamps