air valve

a device for controlling the flow of air, as from a pipe or tank. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air valve
1.  a device for controlling the flow of air in a pipe
2.  See also bleed valve a valve for exhausting air from a fluid system, esp from a central-heating installation

Collins English Dictionary - Complete & Unabridged 10th Edition
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