Learn from a series of frequently asked questions about various types of plastic pipe and fittings, including how green building systems use plastic pipe and fittings. PEX plumbing, PEX fittings, PEX tools. PEX (or crosslinked polyethylene) is part of a water supply piping system that has several advantages over metal pipe (copper, iron, lead) or rigid plastic pipe (PVC, CPVC, ABS) sucioent.com is flexible, resistant to scale and chlorine, doesn't corrode or develop pinholes, is faster to install than metal or rigid plastic, and has fewer connections and fittings. GI Pipe Fittings Exporters in India. We are Galvanized Iron Pipe Fittings manufacturers in India and exporter of unik pipe fittings having plus distributors.