vent pipe

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

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Every plumbing fixture must have a trap and every trap must be protected with a
  vent pipe.
Sumps used as the suction point in a sub-slab depressurization system shall
  have a lid designed to accommodate the vent pipe.
The vent pipe is typically located against or within a few feet of the building
  wall.
The vent pipe may extend up from the rear of a riser.
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