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Pneumatic drum pumps (also called air-powered or air-operated barrel pumps) are motor-driven devices powered by a compressed air supply to draw out fluids from a container. They allow more precise flow control than electric drum pumps and generate higher flow rates than hand drum pumps to dispense or transfer moderate to large amounts of fluid. These air-operated transfer pumps connect to an adapter that allows the intake shaft of the pump to be mounted through the bung hole of a drum or other container. They're used for pumping fluids at manufacturing plants, construction sites, automotive shops, and other facilities with air compressors or compressed air systems.