petcock :

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  • n  regulator consisting of a small cock or faucet or valve for letting out air or releasing compression or draining

  • Prime trick was to stop a motorist, "inspect" his brakes, lights, horn, windshield wiper, then lift his hood and close the petcock on his gas line so that when released he would .
  • He tore up some documents and opened the petcock of a single Bunsen burner.

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