petcock

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pet·cock

 (pĕt′kŏk′)
n.
A small valve or faucet used to drain or reduce pressure, as from a boiler.

[Perhaps pet + cock.]

petcock

(ˈpɛtˌkɒk)
n
(Mechanical Engineering) a small valve for checking the water level in a steam boiler or draining condensed steam from the cylinder of a steam engine
[C19: from pet1 or perhaps French pet, from péter to break wind + cock1]

pet•cock

(ˈpɛtˌkɒk)

n.
a small valve or faucet, as for draining off excess or waste material from the cylinder of an internal-combustion engine.
[1860–65; pet, perhaps < French pet (see petard) + cock1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.petcock - regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or drainingpetcock - regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining
regulator - any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.
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Most engine owners sincerely believed that the engineers who designed the device purposely concealed the petcocks from sight, or placed them in hard-to-reach places.