Mount a Guardair Vacuum Generating Head on any Guardair 10 gallon canister 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. Very high vacuum lift (D venturi) and medium vacuum lift (S & M venturi) versions available. Factory installed options include: HEPA Filtration and Extra Silent Exhaust. Non-returnable item.