RIDGID 9 Gallon 4.25 Peak HP NXT Wet/Dry Shop Vacuum with Filter, Locking Hose and Accessories HD09001 - The Home Depot
WORKSHOP Vacuum Filter for 3-4.5 gal. Wet/Dry Shop Vacuums at Tractor Supply Co.
MULTI FIT Wet Dry Vac Filter VF7816 Standard Replacement Wet/Dry Vacuum Cartridge Filter for Select CRAFTSMAN Shop Vacuum Cleaners 5-Gallon and Larger - - Amazon.com