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PVC-U fitting is a type of plastic fitting. Fittings are used in pipe and plumbing systems to connect straight pipe or tubing sections, to adapt to different sizes or shapes, and to regulate fluid flow, for example. Fittings, especially uncommon types, can be expensive, and require time, materials, and tools to install, so they are a non-trivial part of piping and plumbing systems. While there are hundreds of specialized PVC-U fittings manufactured, some fittings are used widely in piping and plumbing systems. These fittings include elbow, reducer, tee, cross, cap, plug, nipple, barb, closet flange, clean-outs, trap primers, combo-tee, sanitary tee, double sanitary tee, wye fitting, double-tapped bushing, hydraulic fittings, etc.. PVC-U fittings are made from PVC-U, a type of plastic. Polyvinyl chloride, commonly abbreviated PVC, is a thermoplastic polymer. PVC-U (Unplasticized polyvinyl chloride), also called UPVC, is a rigid, chemically resistant form of PVC used for piping, window frames, and other structures. PVC-U fittings have become very popular these days for water supply and drain lines. The low cost, good durability and easy installation has made plastic pipes most popular. Threaded PVC-U fittings thread almost like metal fittings. When both hot and cold water are to be carried, it is advised to install special transition fittings in order to prevent leaks caused by the different expansion rates of plastic and metals. PVC-U is a popular material used for making plastic pipe fittings. These fittings are rigid and are connected by thread or solvent weld (glue) connections. PVC-U pipes come in different pressure ratings and fittings should be chosen accordingly.