Shop-Vac 9030400 Vacuum Cleaner Wet / Dry Pickup Cartridge Filter
Shop-Vac 90304 Cartridge Filter, For Full Size Wet-Dry Shop-Vac Vacuums Wet/dry cartridge filter. Combats tough vacuum challenges. For small, dry debris and wet materials. Original equipment quality.
Pros: Essential for keeping your Shop-Vac in good working order.
Cons: A bit on the expensive side.