ERA PVC/UPVC/Pressure Pipe fittings NSF Certificate SCH80 End Plug of 1/2"-6" for Professional China Plastic ManufacturernPVC pipes (divided into PVC-U pipes, PVC-M pipes and PVC-O pipes) Rigid polyvinyl chloride pipes are made of polyvinyl chloride resin, stabilizers, lubricants, etc., and then extruded by hot pressing. The earliest plastic pipe to be developed and applied.nPVC-U pipes have strong corrosion resistance, are easy to bond, are low-priced, and are hard in texture. However, due to the leakage of PVC-U monomer and additives, they are only suitable for water supply systems with a delivery temperature not exceeding 45°C. Plastic pipes are used in applications such as drainage, wastewater, chemicals, heating and cooling fluids, food, ultrapure liquids, slurries, gases, compressed air and vacuum systems.