Tee also known as pipe fittings tee or tee fittings, tee fittings and so on. Mainly used to change the direction of the fluid, used in the main pipe to branch pipe. Can be categorized according to the size of the pipe. Generally made of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon chrome asphalt, pvc and other materials.