HQRP Washable Cartridge Filter 4-Pack for Shop-Vac 903-04-00 9030400 90304 903-50-00 fits 86L350 86L400 86L450 86L500 86L550 Vacuum Cleaner Coaster HQRP&reg; 4 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!