Drain cock

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Terms & Synonyms

Official WHO Definition

A valve, usually installed in the lowest portion of a piping system or vessel, that controls the flow of liquid from the system or vessel (WHO 2006).A drain cock is a drain tap found in a pipe system, a pump, a water heater, a vessel or cylinder, in a radiator or water jacket and used to drain water, steam and/or air from a sealed water system. It can also be called a drain valve (World Plumbing Council Working Group 2008).

Other Definitions


Interpretations and Explanations

A drain cock may consist of a simple jumper type valve, a plug valve, diaphragm valve, ball valve, butterfly valve, used in any commissioning, maintenance, cleaning, purging or for draining of a plumbing system. A drain cock is used when access is required on regular basis (World Plumbing Council Working Group 2008).


WHO (2006) Health aspects of plumbing

WHO Lexicon page (translations and examples)

See also

External Resources


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