Pipe tee uses for connecting pipes and pipe fittings. There are usually PVC pipe tee, copper tee and so on. Also known as pipe fittings tee, tee joints, used in the main pipeline to branch pipe. PVC pipe tee has equal and reducing difference, the diameter of the equal tee is the same size, and the size of the branch pipe tee is smaller than the size of the pipe tee in charge of the main pipe. Pipe tee is widely used to transport liquid, gas pipe network, in use is generally an import, two exports; or two imports, an export. For three identical or different pipelines, the main role is to change the direction of the fluid.