4-Ply Reinforced High Temp Silicone Coupler and The hose material is high quality silicone Min temperature: -60 C/-140 F. Max temperature: 230 C/428 F. Bursting pressure: 2MPA Inner Diameter:4" (102mm) . Leg Length: 4.5"X4.5". Wall Thickness: 5MM . Universal Application for Connecting Turbo Piping or Intake Piping Silicone hose is NOT compatible with fuel or oil. work pressure: 0.3 to 0.9 MPA. Bursting Pressure: 2MPA. Size tolerance: +/- 0.5MM. TenkeAuto products limited 12 Months warranty from the date of purchased ( FREE RETURN within 30 days No QUESTION ASK)