HQRP 2-Pack HEPA Cartridge Filter for Shop-vac 903-04-00/9030400 / 903-04/90304 (Type U) Replacement fits most Wet/Dry Pickup Vacuum Cleaner Coaster HQRP&reg; 2 Cartridge Filters plus HQRP&reg; Coaster; HQRP filters are washable and reusable! This PP compound filter is H12 filtration class and retains 99.97% of particles down to 0.3 micron. Dimensions: diameter: 7.4"; height: 6.7" 100% Compatible with Original filter; 2 weeks DOA replacement warranty!