Plumbing pipe is made from various materials: copper, galvanized steel and iron, polyvinylchloride (PVC), chlorinated polyvinylchloride (CPVC), cross-linked high-density polyethene (PEX) and polybutylene. The major categories of plumbing systems or subsystems are potable cold and hot tap water supply, plumbing drainage venting, sewage systems and septic systems with or without hot water heat recycling and greywater recovery and treatment systems, Rainwater, surface, subsurface water drainage. fuel gas piping. Plumbing is any system that conveys fluids for a wide range of applications. Plumbing uses pipes, valves, plumbing fixtures, tanks, and other apparatuses to convey fluids. Heating and cooling, waste removal, and potable water delivery are among the most common uses for plumbing, but it is not limited to these applications.