Drain-waste-vent, or DWV, is a type of plumbing systems in which sewage is taken from a building and noxious gases are vented. Waste enters the DWV from plumbing fixtures such as toilets, sinks, bathtubs and showers. The waste exits the fixtures through a dipped section of pipe called a trap, which maintains a constant supply of water. All plumbing fixtures must have traps to prevent gases backing up into the home or building, with rather unattractive and unhealthy results.
Traps connect plumbing fixtures to a common waste line, which channels waste to what is euphemistically called a soil stack. The waste is then removed from the building through a main drain and taken to a sewage line.
The venting system pipes are an important part of any plumbing system. It is their job to connect fixtures directly to the outdoors, often through the roof. Vents serve several purposes; they allow an outlet for sewer gases, they encourage oxygen circulation which allows sewage to begin to decompose, and they prevent sewer gases from entering the building. With few exceptions, every plumbing fixture is required by building codes to have an attached vent. These vents are sometimes descriptively called stink pipes.
Because gravity is the force powering these plumbing systems, it is critical that all pipes have a downward slope throughout the system. In instances where a downward slope out of a building and into the sewer cannot be created, a collection pit and grinding lift 'sewage ejector' pump are used to deliver waste to the sewage system.
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