... indicator of PP-R are much better than galvanized pipe, UPVC pipe, polyethylene-aluminum compound pipe, PE-X (cross-linked ... are the manufacturer specialized in producing many different kinds of pipes and fittings more than 6 years, mainly dedicated to developing ... producing “Hongyuan” brand PE-Xa heating pipes, PE-RT geothermal pipes, PP-R hot/cold water pipes, PP-R fittings and manifolds. If ...