Ball cock



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.
Historical Examples

On top of the generator is a tipping water-bucket I supplied with water through a ball cock.
Acetylene, The Principles Of Its Generation And Use F. H. Leeds

noun
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 with the water level in the cistern

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