From Longman Dictionary of Contemporary Englishair pumpˈair pump noun [countable] TZAIRa piece of equipment used to put air into something
Examples from the Corpus
air pump• When connected and adjusted, an air pump needs very little attention.• His other suggestions were in respect of a chemical pump and an air pump.• His undergravel filter, therefore was best powered by an air pump rather than powerheads.• Which you choose, an air pump or alternative means, is a matter of personal choice.• The equipment need only be a sponge filter, air pump and heaterstat.• At the same time the air pump removes waste water and air from the separate condenser thus maintaining a vacuum in it. 