DESC: Shop Vac Ultra-Web Cartridge Filter for Wet or Dry Pickup. Nanofibers make clean up a snap. Easy on/off design. Fits most Shop-Vac brand wet/dry vacs* Designed to combat your toughest challenge, the Ultra-Web Cartridge Filter can be used for both wet and dry pick-up and fits most Shop-Vac wet/dry Vacs. (Does not fit 1x1, BullDog Portable, Mighty Mini, Hippo, or AllAround Series) Up to 5 times more efficient. For small, dry debris and wet materials like cold fireplace ash, auto refinishing, cement dust, sawdust, and drywall dust.