Air Operated Vacuum Pump/Liquid Pump A reliable drum mounted vacuum pump for fast emptying of cutting fluids, paint sludge, water, waste oil etc. from machine tools, spray booths, engines or other machines. The vacuum is easily adjusted with a needle valve and is indicated on a gauge. When the drum is full, the pump stops automatically and an indicator shows current status. Vacuum Pump, basic model Basic model, (22582) comprising pump body and bung adapter only, for mounting in drums or tank with 2" thread