Squirrelly 3.5" to 3.5 Inch Straight Silicone Coupler Hose Intercooler Piping Turbo 3-Ply Black Squirrelly's line of silicone couplers feature 3 layers of polyester reinforcement and are suitable for applications with boost pressures up to 45psi. Size: 3.5" Leg Length: 3" Material: 3-ply Polyester Reinforced Temp: 428 Degrees F (220 C)