Word forms: (regular plural) drain plugs
(Automotive engineering: Vehicle components, Engine, transmission, and exhaust) A drain plug is a plug which is taken out to allow a fluid to be drained from a tank such as an engine oil pan or sump. ▶ plug1, plug2
⇒ Remove the oil drain plugand allow oil to drain out. ⇒ Remove the drain plug under the engine with the wrench, and let the oil flow into the pan. ⇒ The engine should be run for a few seconds to drive residual water out of the exhaust
system, after which the drain plug needs to be removed from any water-lift-type muffler.
Collins English Dictionary. Copyright © HarperCollins Publishers