ARO equivalent - Air Operated Double Diaphragm Pump

An air operated double diaphragm pump (AODD) is a type of positive displacement (PD) pump. It consists of two pumping chambers that are alternately filled and discharged by the movement of flexible diaphragms. Compressed air is alternately fed to, and vented from, air chambers on the opposite sides of the diaphragms to create the pumping action.

These pumps are driven by air and are often abbreviated to AODD, AOD or shortened to Diaphragm Pump. They are used in situations where an electrically powered pump would not be advisable (e.g., when pumping flammable liquids)