Compressed air drum pumps are manufactured in 316L Stainless Steel. Reversible drum pumps are maintenance free systems to recover spilt 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 gallons 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.