ball cock


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ball cock

a device for regulating the flow of a liquid into a tank, cistern, etc., consisting of a floating ball mounted at one end of an arm and a valve on the other end that opens and closes as the ball falls and rises
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

ball cock

A float valve with a spherical float.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.