A pipe tee is a type of fitting or connector used to join two or more plumbing pipes. These fittings join the two pipes or tubes at a 90-degree angle, and get their name from their T-shaped appearance. The pipe tee is one of the most versatile of all plumbing connectors, and is widely used in residential, commercial, and industrial applications.

Using a pipe tee, a plumber is able to combine the flow of two separate pipes into a single line. He may also divide a single supply line so that it flows to two different areas. For example, a pipe tee can be used at the main water supply line in a home to direct some water to the bathroom and some to the kitchen. It may also be used in the home's wastewater system, where it joins two separate sewer lines into a single main drain line that can tie into a municipal drainage pipe. In industrial applications, a pipe tee can join two pipes carrying different liquids, which blends the two materials into a single stream as they flow to their final destination.