escape cock


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Noun1.escape cock - a valve in a container in which pressure can build up (as a steam boiler)escape cock - a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
valve - control consisting of a mechanical device for controlling the flow of a fluid