... completely both disadvantages of PP-R pipes' thermal expansion and copper pipes' easy leakage, fast heat conduction and high cost, ... More Durable With its special pipe structure, POLYGON PP-R copper pipe has small thermal expansion coefficient and easy welding, which ... requires the conveyer systems of higher pipeline extensively.PP-R Copper Pipe Art.No. Specification Color:Green1702020×3.41702525×4.2 ...