Made of High Temp 4-ply Aramid Reinforced Silicone Meet and exceed SAEJ20 industry standards, designed and engineered to provide a connection between engine mounted charge air system components Ideal for handling slight misalignments and isolating vibration between hose ends; Great for marine and industrial use, custom turbo or intercooler piping fabrication UV and ozone resistant Silicone hose is NOT compatible with fuel or oil; Inside Diameter:4