ballcock

ball cock

noun
a device for regulating the supply of water in a tank, cistern, or the like, consisting essentially of a valve connected to a hollow floating ball which by its rise or fall shuts or opens the valve.
Also, ball·cock.


Origin:
1780–90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ballcock is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
WordNet
ballcock

noun
floating ball that controls level in a water tank 
WordNet® 3.0, © 2006 by Princeton University.
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