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

A three-way is a type of industrial piping fitting with three openings: 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 pipe ends, used at junctions where three identical or different pipelines converge. The primary function of a three-way is to alter the direction of fluid flow.