Generating 63% more vacuum flow than single venture units, guardair 55 gallon dual venturi drum vacuums pick up the heaviest of chips, dust, debris, liquids or sludge, quickly and efficiently. Powered by compressed air, always dependable and trouble free with no motors or moving parts to wear out, these units generate exceptional vacuum lift and vacuum flow. Equipped with dual b type ventures. Factory installed options include: liquid shutoff assembly, hepa filtration, and extra silent exhaust. non-returnable item.