In plumbing, fittings perform three jobs: (1) they continue straight runs of pipe; (2) they enable pipe to make turns; and (3) they allow changing from one type of pipe to another, for instance, galvanized to plastic.
There are fittings for water and for waste, as well as for the different pipe materials used. Fittings for waste and water come in essentially the same shapes, though drain or DWV (drain-waste-vent) fittings are bigger.
You can assume that any fitting you need to join pipe will be available. Following are examples of the kinds of fittings available:
== Elbow: Curved, shaped roughly like an elbow. Its purpose is to change a pipe's direction. It comes in 90 or 45 degrees.
== Tee: A T-shaped fitting with one vertical section and two straight sections coming off it and forming the top of the T. It enables water or waste to travel in three different directions.
== Wye: A Y-shaped fitting
== Tee wye: As the name suggests, a blend of a T and a Y
== Nipple: A short pipe section used to extend the length of pipe in conjunction with another fitting
== Coupling: Used to join two pieces of pipe together
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