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1929, Ernest Hemingway, A Farewell to Arms, Folio Society, published 2008, page 297:
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.
2010, International Fire Service Training Association, Essesntials of Fire Fighting and Fire Department Operations, 5th Edition, p. 780:
The shutoff valve (petcock) is usually located on the gas pipe on the supply side of the meter.