A tee pipe, or pipe tee, is a T-shaped pipe fitting used to connect three sections of pipe, allowing fluid or gas to split or combine flow within a piping system. It features one inlet and two outlets (or vice versa) arranged at 90-degree angles to each other. Tee fittings are available in various configurations, such as equal tees (with all ends the same diameter) or reducing tees (with one or more different diameters). They are essential components in plumbing, HVAC, industrial, and process piping systems, and are made from materials like steel, copper, PVC, or stainless steel.