Pro-Team ProGuard 10/15/20 1 layer Pleated Wet/Dry Cartridge Filter with press fit technology 8/case GK-R4000-8 Replacement ProTeam Cartridge filter for Pro-Team ProGuard 10/15/20 . High Efficiency (3) layer Micro Pleated material best for Fine Dust. 99% Efficient to 1 Micron. Pleated design resists clogging. Uses Press Fit Technology eliminating the need for the screw on attachment. Simply press the filter on and when the filter is due to be replaced, pull it off. Guaranteed Fit & Performance.Clean with Confidence, Replace with Green Klean.