Three-way connectors are used for pipe fittings and pipeline connections. Also known as three-way pipe fittings or three-way connectors, they are used where the main pipeline needs to branch off.

A three-way fitting is a type of piping component with one inlet and two outlets; or two inlets and one outlet. It comes in T-shaped and Y-shaped designs, with both equal and unequal diameter openings, used at junctions where three pipes, either identical or different, converge. The primary function of a three-way fitting is to alter the direction of the fluid flow.