Three-way connectors are pipe fittings and pipe connectors. 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 is a type of industrial pipe fitting with three outlets: one inlet and two outlets; or two inlets and one outlet. It comes in T and Y shapes, with both equal and unequal diameter outlets, used at junctions where three pipes, either identical or different, converge. The primary function of a three-way is to alter the fluid direction.