... of 60 years; (2) hard with a metal pipe, but also easy to bend and straighten the ... having to heat; (3) high temperature high pressure, pipe deformation, through the wall safe buried; (4) Temperature ... (5) outer wall smooth, fluid resistance, connected by pipe hot-melt, melting into one, does not leak, does ... of green environmental protection energy-saving water. PEX-a Pipe Production Line