Petcock

A petcock is a small shut-off valve used to control the flow of liquid or gas. Historically, petcocks were threaded valves controlled by a butterfly handle; modern petcocks are typically ball valves.

For pet cocks, see Pet chicken.
See also: Stopcock

Compared to the progressive control of a gate valve a ball valve style petcock's is coarse, confining their use principally to on-off applications.

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