Mount a Guardair Vacuum Generating Head on any standard 55 gallon drum* for instant, high-performance vacuum capability. Ideal for vacuuming up chips, dust, debris, liquids or sludge. Powered by compressed air, always dependable and trouble free with no motors or moving parts to wear out, Guardair Vacuum Generating Heads produce exceptional vacuum lift and vacuum flow while operating quietly and efficiently. Non-returnable item.