Tee is also called pipe fitting tee or tee fitting, tee joint, etc. It is mainly used to change the direction of fluid and is used at branch pipes of the main pipeline. Can be classified according to pipe diameter size. Generally made of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon, PVC and other materials. Tee fittings are used where pipelines have branches. Because they are convenient and simple to use, they are widely used in chemical industry, civil construction, machinery manufacturing, shipbuilding industry and other fields.