System1 Designss 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. Finish up your custom piping with one of our silicone couplers. Use for air intakes, intercooler piping, turbo inlet/outlets and more. ? Leg Length: 3.5" Material: 3-ply Polyester Reinforced Temp: 428 Degrees F (220 C)