Manufactured in 316L Stainless Steel: The Reversible Drum Angel/ Drum Pump is a maintenance free system to recover spilled liquids, coolant, sludge, tramp oil, wastewater and other liquids using only compressed air. The compressed air system attaches easily to any closed head of a drum (30 or 55 US gallon, or 45 Imperial gallon or 205 litre drum) The reversible feature allows you to fill or empty the drum in under two minutes with the simple turn of a knob. Using no electricity, these system last and last, unlike many electrical units that wear out quickly in harsh industrial.