DESC: No need to change filters when changing from wet to dry pick up. (Used to be a real hassle). Filters can be cleaned without removing the lid. (Takes 30 seconds to do). Excellent on sheetrock dust! (Every contractors dream). All the tools, including the hose, are stored onboard the vacuum. (How convenient!). The drain can be regulated from a drip to a full flow when emptying liquids. Suction hose can be used as a drain hose. (You can actually hit the floor drain). Automatic air shut off for wet pick ups. Patented double filter system. Designed with the contractor in mind.