vent pipe
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noun Plumbing.
a pipe above a waste pipe or soil pipe that allows gas to escape from the system.
Origin of vent pipe
First recorded in 1855–60
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for vent pipe
Historical Examples of vent pipe
Typical simple forms of vent-pipe suitable for acetylene apparatus are shown in Fig. 7.
It is indispensable that every acetylene apparatus shall be fitted with a safety-valve, or more correctly speaking a vent-pipe.
Nevertheless this form of vent-pipe produces a gurgling noise, and would be better for a trumpet-shaped mouth.
So tall a vent-pipe, however, seriously raises the centre of gravity of the bell and may make it top-heavy.
No water enters the vent-pipe from the holder, and therefore no gurgling or irregular pressure is produced.