DWV parts look very similar to standard white schedule 40 PVC pipe and fittings. The only real difference is that DWV PVC is not made to handle pressurized uses like schedule 40 parts are. Instead, DWV pipe and fittings are made to handle a different class of uses – Drain, Waste, and Vent (hence the name DWV).  Drain, waste, and vent applications use gravity to create the flow of water and waste through the pipe line. These applications cause minimal stress on the PVC parts, allowing for thinner walls and the elimination of pressure testing by the manufacturer.  Another difference between DWV and standard PVC parts is the end types. Standard schedule 40 PVC fittings have ends that are either threaded or socket (sometimes called slip). DWV parts sometimes come threaded, but their slip style fitting ends are called “hubs,” and are usually shallower than the deeper schedule 40 ends. For example a slip coupling may be called “HUB x HUB” or “H x H” for short.
VMS stocks PVC DWV fittings in sizes ranging from 1-1/4” through 6” and in all available shapes including unions, changes of direction (bends, elbows), branches (tees), bushings, reducers, adapters, couplings, collars etc., allowing for unlimited possibilities of connection.