Drain Waste Vent

A re vent or revent pipe in a plumbing drain waste vent or dwv system is an auxiliary vent that is attached to the drain pipe close to an individual plumbing fixture.

Drain waste vent.

Drain waste vent dwv pipes carry waste and water smoothly out of the house without gurgles or fumes. The re vent or revent pipe is routed upwards above the fixture and then horizontally over to a tee that attaches it to the main stack vent pipe. The drainpipes collect the water from sinks showers tubs and appliances. The true vent is aligned vertically and attaches to your drain line through the roof.

The waste pipes remove water and material from the toilet. The vent pipes remove or exhaust sewer gases and allow air to enter the system so that the wastewater flows freely. In modern plumbing a drain waste vent or dwv is part of a system that allows air to enter a plumbing system to maintain proper air pressure to enable the removal of sewage and greywater from a dwelling. The dwv system is for the removal of waste water and material from the building.

It lets air into the system filling the vacuums left by water moving through the pipe. As the water runs down proper venting is required to avoid a vacuum from being created. This allows unpleasant and potentially dangerous odors or fumes to safely leave your plumbing system escaping harmlessly into the air outside. This is best implemented if a fixture rests close to the stack and the top floor of your home allowing the stack to serve as a vent.

The main soil stack for toilets is normally a 4 inch pipe. This requires an air passageway behind the water. Drain waste vent dwv pipe sizes the pipes of a dwv system are larger in diameter than normal water supply pipes typically 1 1 4 inches to 4 inches to minimize the possibility of blockages. Showers usually have a 2 inch pipe.

The drainpipes are made of cast iron galvanized pipe copper or plastic. The drain waste and vent dwv system is perhaps the most important part of the total plumbing system in a building. Vent pipes run from waste or drain pipes upwards ending outside the building usually sticking up through the roof.