What is drain-waste-vent (DWV) system?
Well, the plumbing system of the house with large-diameter pipes that carries water and waste to a sewer line or septic tank is called the drain-waste-vent (DWV) system. The name itself consists of three words – Drain Line, Waste Line and the Vent Line. The drain lines collect water from sinks, showers, and tubs; the waste lines carry waste from toilets; and vent lines exhaust sewer gasses and provide the necessary air pressure to allow wastes to flow freely. All these drain and waste lines must always slope slightly downward from the fixture toward the sewer or septic system. Water and wastes are carried by gravity.
