Designed for use with 1/2" ID Silicone Heater Hose One Continuous LengthEngineered To Withstand: Oil Splash Resistance, Ozone Resistant, Direct Sunlight, Cool Temps, Hot TempsInside Diameter (ID): 0.500" (13mm)Outside Diameter (OD): 0.83" (21mm)Bend Radius: 5 times the Hose IDWall Thickness: .160"Weight LB/FT: 0.181Actual Burst Pressure - PSI: 310SAE J20 R3 Class A - PSI: 250TMC RP303B Class 1 Grade II - PSI: 125Extreme temp range: -65F to +350F (Don't be fooled by higher than 350F temps. Those are for applications where the hose life is greatly reduced!)Material: Blue Cover, with Nylon Fiber ReinforcementConstruction: Silicone hose with 1-ply of Nylon Fiber