Main pipe body：stainless steel 304, 316, Corrugated pipe Protection: PVC or PE wrapping material Fittings: stainless steel 304, Screw connection All these parts make a strong durable pipeline system. • Willie floor heating composite pipe The company of Willie produces stainless steel flexible composite pipe is used t the high-quality stainless steel 304 material, flexible composite pipe,is with a special processing it has excellent thermal conductivity, high temperature, high pressure, aging, etc., equipped with stainless steel connecting tubes and system components, on-site construction is easy, quick and easy installation, then use of the normal life is up to 70-100 years