PPR Al PPR composite pipe: 1.Working pressure:PN16/PN20/PN25 2. ... PPR composite pipePP-R aluminum plastic composite pipe is a composite pipe of five layers, inside and outside ... used in building water supply systems, heating pipe systems, air-conditioning systems, and domestic hot ... supply PE pipe, PPR pipe, SRTP pipe, SRTP pipe, PE-RT pipe, HDPE pipe, UHMW PE pipe and supporting pipe fitting used ...