Dripstick

A dripstick is a tube installed vertically in the bottoms of fuel tanks of many large aircraft. To be read, a dripstick is withdrawn from the lower surface of the wing. When the top of the dripstick is withdrawn below the level of the fuel; fuel enters the dripstick and drips through a hole in the cap. Graduations on the dripstick indicate the level of the fuel in the tank.

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Dripstick