1.pex-al-pex pipe 2.composite pipe five layer 3.Standard: ISO9001,CE,PCT 4.15 experience 5.High quality & ... Aluminum plastic composite pipes(PEX-AL-PEX pipe) for cold/hot water supply:1, Non-toxic, corrosion resistance,light weight, good mechanical ... easy scaling, fluid not being polluted, and effective large diameter. 3, 100% insulating oxygen,stop oxygen's penetration. Aluminum-plastic pipes ...