The silicone hoses are reinforced with 1-ply polyester fabric. These silicone heater hoses which are resistant to coolant solutions, cold leaks, cracking, peeling, aging and ozone. Hotop silicone heater hose meet and exceed SAEJ20 industry standards, and ideal for heavy-duty pressure connections and provides excellent resistance for high-temperature applications such as custom turbo or intercooler piping, DIY intake or radiator …