Petcock

//ˈpɛtkɒk// noun

Definitions

Noun
  1. 1
    A small valve, spout, or faucet operated by hand, usually used to release pressure or drain fluid.

    "The doctor placed the rubber mask over her face and turned a dial and I watched Catherine breathing deeply and rapidly. Then she pushed the mask away. The doctor shut off the petcock."

  2. 2
    regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining wordnet

Etymology

Apparently from pet + cock, because of its size.

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