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Pipe Fittings   

Pipe fittings are small and often standardized accessories to drain, waste, and vent (DWV) systems, covering many components that connect pipe ends for in-line, offset, multi-port, and mounting configurations.

They are manufactured from a wide variety of materials for the transport of an equally wide variety of solids and fluids. Fitting cross sections are often, but not necessarily, circular in shape to mate with the pipe sections they are connecting; systems are typically configured with straight sections connected by fittings or specially-formed connections and joints. Pipe fitting construction and material specifications are application-dependent; user consultation with fitting suppliers is typical for optimization of component selection. When specifying pipe fittings, size is the key parameter to consider.

Common types of pipe fittings include adapters, pitless adapters, bulkhead fittings, caps, compression fittings, rigid couplings, flexible couplings, cross or 4-way fittings, 90 degree elbows, 45 degree elbows, reducing elbows, end bells, expansion joints or couplings, ferrules, flanges, nipples, offset fittings, plugs, concentric reducers, eccentric reducers, returns or traps, side outlet elbows, side outlet tees, standard tees, reducing tees, bullhead tees, unions, standard wyes, and reducing wyes.  Some pipe fittings have a swivel feature that allows one or more fitting ends to rotate or swivel.