Combination Waste and Vent System


Plumbing Code

Combination Waste and Vent System

A specially designed system of waste piping embodying the horizontal wet venting of one or more sinks, lavatories, drinking fountains or floor drains by means of a common waste and vent pipe adequately sized to provide free movement of air above the flow line of the drain.

(International Plumbing Code® 202.0)