... quality materials,sizes from dn20-dn32 Jiangte brand steel-plastic composite pipe lined with galvanized steel pipe PE, pp-R, PE-RT, PE- ... commercial building water supply systems;2,Industrial piping systems for industrial water supply system, sewer, gas piping, air ... system, automatic fire extinguishing system;3,Chemical Piping Systems for transport of various chemical media, corrosive media, etc.;4 ...