By regulation, aircraft fuel systems must be designed with a way to manually stop fuel flow to the engine. In some aircraft, this is accomplished by simply installing an on-off valve in line with the engine fuel supply. On others, manual control is provided in conjunction with a selector allowing fuel to be taken from one or both tanks independently. In most of the Piper Cherokee series, this function is accomplished by using a brass body that accepts a fuel-supply line from each tank and a brass inner cone drilled to route fuel in the proper direction. It's a simple device with a limited function and seldom is maintenance required.
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