PVC-U pipe is made of sanitary grade polyvinyl chloride (PVC) resin as the main raw material, and added with appropriate amount of stabilizer, lubricant, filler, color enhancer, which is extruded by plastic extruder and molded by injection molding machine. The production of pipes and pipe fittings is completed through cooling, curing, shaping, inspection, packaging and other processes.It has excellent physical and chemical properties, chemical corrosion resistance, high impact strength, small fluid resistance, 30% increase in flow compared with cast iron pipes of the same diameter, aging resistance, long service life, and service life of not less than 50 years. It is an ideal material for building water supply and drainage. Light and durable, easy to install, effectively speeding up the project progress. The construction cost can be saved. Compared with cast iron pipes of the same specification, the construction cost can be greatly reduced.