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Definition of "Petcock" |
A small valve or tap which is used to control the flow of liquid. You may find one at the bottom of a radiator to permit draining the radiator. A petcock may also be found on the line coming from the fuel tank in small engines and motorcycles. It allows you to cut the flow of gasoline going to the carburetor. On some motorcycles, the position of the petcock lever may permit draining the last part of the fuel tank as a reserve position. In units where the carburetor is fed by gravity feed from a fuel tank, turning off the petcock when the unit is not in operation may prevent gasoline from leaking past the carburetor's needle and seat and into the crankcase to dilute the oil. |
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