Ideal for wet vacuum applications, Liquid Shutoff Assembly limits intake of vacuumed fluids when drum is full, preventing damage to exhaust silencer. Float ball rises as liquid level rises, blocking vacuum inlet of the PowerQUAD^™ engine, ceasing vacuum operation. Wire cage with internal float ball mounts to underside of drum cover and replaces cartridge filter. Fits Guardair PowerQUAD^™ 20, 30 and 55 Gallon Drum Vacuums and Vacuum Generating Heads.