The pipes leading from the distribution main of water supply to the house's plumbing system are known as service pipes. These service pipes are made from different materials, as classified below. Copper pipes. Galvanized iron pipes. Polythene pipes. Plumbing is the system of pipes and fixtures installed in a building to distribute and use potable (drinkable) water and remove waterborne wastes. It distinguishes from water and sewage systems that serve a group of buildings or a city.