Plastic-lined fittings are also called plastic-lined pipe fittings, including elbows, tees, crosses, reducers, etc. It adopts the lining material and corresponding size of the same material as the steel-plastic composite pipe, and is used together with the pipe, which has the same anti-corrosion ability as the pipe, and has interchangeability and versatility. Mainly used in chemical industry, petroleum engineering, electric power engineering, pharmaceutical industry, mining industry, smelting industry, etc.