Shop-Vac 9033400 HEPA Dry Cartridge Filter Dry cartridge filter provides high efficiency filtration for fine dust and debris Ideal for picking up material such as drywall dust, cement dust, and saw dust Foam sleeve protects filter; captures 99.97-percent of particles down to 0.3-microns Designed for dry use only; works on most full-size wet/dry vacuums Fits most Shop-Vac Brand wet dry vacs 5 gallons and larger