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Noun1.drainplug - a removable plug for holding water in a tub or basin
plug, stopple, stopper - blockage consisting of an object designed to fill a hole tightly
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Unfortunately, that gas mileage will get a whole lot worse if you've got a leaky fuel tank drainplug.
Threaded drainplug twisted so tight it can't vibrate loose and the receiver has twisted loose, allowing water behind its seal.
We also offer an optional drainplug or slide valve and, in orders meeting a minimum quantity requirement, your choice of colors.