What Is a Revent Pipe?

A revent pipe, also called an auxiliary vent, attaches to the drain line near the fixture and runs up and over to the main vent. It can attach directly behind the fixture or to the horizontal drain line. ... In the case of a tub that is close to a stack, its drain can empty into a pipe that also serves as a vent.

Can a toilet shower and sink share a vent?

As a general rule, you will just be able to vent 2 fixtures on a toilet wet vent. ... 1) Toilet and Sink: The toilet is vented through the sink drain. The toilet drain should be 3″, the sink drain is 1.5″, the shared sink drain/toilet vent area should be 2″, and the vent going up should be 1.5″.

What is the difference between a water pipe and a vent pipe?

Vent Pipe's First Benefit

Drain pipes allow water and waste to flow out of your home and into the sewer system. A water or supply line brings the water in and lets you fill your sinks, bathtubs and washing machine. A plumbing vent pipe works alongside your drain pipes, except it doesn't carry water.