Squirrelly 2.5" to 1.5 inch 3-Ply Silicone Reducer Coupler Turbo Intake Intercooler Pipe Black 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: 2.5" to 1.5" Length: 3" Material: 3-ply Polyester Reinforced Temp: 428 Degrees F (220 C)