Pipe valves and fittings, such as PVC, nipples, and flanges, are essential components of a piping system that control the flow of liquids, gases, and slurries. They connect, redirect, and regulate the flow of materials through pipes and tubes, including hose and PEX, in various industries and applications. Couplings and CPVC fittings, along with a gasket, can also be used to secure and seal connections in a piping system.