Tee and Wye Fittings - Tees and wyes are used to connect three pieces of pipe. Tees can have one inlet and two outlets at 90-degree angles in the shape of a “T” and are used to split a supply line, or they can combine two lines into one outlet. You often see tee fittings connected to potable water supply lines. A wye is shaped like a “Y” with the two inlets coming together at roughly 45 degrees into a single outlet in drain applications. Sanitary wyes allow wastewater to enter a drain pipe from the side, while the second part of the “Y” aligns with the pipe to allow sewer gases to vent upward.
Cross Fittings - Crosses have four openings for pipes – one inlet and three outlets, or three inlets and one outlet, depending on the need. These four-way fittings are less common and used in some irrigation and sprinkler applications.
Elbow Fittings - Elbows change the direction of flow between two pipes. Common elbows have 90-, 60-, 45- and 22 1/2-degree bends and are used to make a turn. They can be joined together to move around obstructions in the pipe run.
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