Air pump

	1.	(Physics) A kind of pump for exhausting air from a vessel or closed space; also, a pump to condense air or force it into a closed space.
	2.	(Steam Engines) A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air.

Noun

1.

air pump - a pump that moves air in or out of something Synonyms: vacuum pump

condensation pump, diffusion pump, inflater, inflator, ion pump, pump, vacuum pump