Ridgid Vacuum Filter, Housmile Ridgid Shop Vac Filter, VF4000 Replacement Filter Compatible with 5-20 Gallon Wet or Dry Vacuums, Ridgid Standard Wet/Dry Vacuum and Fits Husky Vacs 6 to 9 Gallon :
Ridgid Part # HD06001 - Ridgid 6 Gallon 3.5 Peak Hp Nxt Wet/Dry Shop Vacuum With Filter, Locking Hose And Accessories - Wet/Dry & Shop Vacs - Home Depot Pro