Inner Diameter 4" To 4" 102mm Straight Silicone Hose Intercooler Coupler Tube Pipe Blue Made of High Quality Silicone For High Temperature and High Boost Application 3-Ply Nylon for Strong Reinforcement and Full 4.5mm Thickness Withstands Operating Temperatures from -65F to 500F Degrees Fahrenheit Working pressure 85 PSI / Burst pressure 245 PSI