Extract dust efficiently with the Pre-Filter Set (199827-4). The Pre-Filter and damper provides a filter cleaning system capability for increased cleaning efficiency. The set is constructed of high quality materials for durability and long life. For use with Makita 18V LXT Brushless Cordless 2 Gallon HEPA Filter Portable Wet/Dry Dust Extractor/Vacuum model XCV11Z (sold separately).