union vent

dual vent, common vent, unit vent

dual vent
In plumbing, a single vent, 1 connected at the junction of two fixture drains, which serves as a vent for both.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Desperate for the chance of a Cup run to lift the gloom, a small band of Everton supporters from the fans group Blue Union vented their fury at chairman Bill Kenwright in the car park as he arrived for the match.
The union vented its anger over Glastir as Mr Elgar announced he is stepping down as a partner in his 1,000-acre organic livestock farm at Llanerfyl, long recognised as a beacon of good farming practice.
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