Verderair air operated diaphragm pumps are excellent drum pumps. For the emptying of small barrels, containers, canisters and drums (approx. 200 litres) of all kind of chemicals such as acids or lyes, a double diaphragm pump is a very good alternative to a conventional rod drum pump. Diaphragm pumps can pump corrosive, viscous and abrasive fluids with ease.