OD: 3/16 1/4 5/16 3/8 1/2 5/8 7/8 Thickness: SWG, Customized Features: Clean surface of internal and external, bright finish, high precision of size, easy to transport, process and install, high pressure resistant. Applications: the best choice for the supply of water, gas and heating piping system. Widely used in hot and cold water supply and drainage for building, drinking water, gas. treatment, food and chemical industry.