vent pipe

American  

noun

Plumbing.

1. a pipe above a waste pipe or soil pipe that allows gas to escape from the system.

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Etymology

Origin of vent pipe

First recorded in 1855–60

Example Sentences

They think the purpose of the vent pipe is to expel sewer gas outside.

From Seattle Times

The vent pipe in your roof allows the air to enter the system to replace the air being pushed through the pipes by the drain water.

From Seattle Times

This extra pipe was a vent pipe.

From Seattle Times

I didn’t understand how that vent pipe worked at the time, but after a few trips to the local library, I discovered why the pipe was a vital part of the system.

From Seattle Times

I created a small bathroom with normal fixtures, but instead of using the code-required vent pipe sizes, I vented the entire bathroom with just 1/2-inch-diameter pipe.

From Seattle Times