HQRP Active Filter fits AH 30 Miele S2181 Titan, S768, S212 Olympus, S2121 Delphi, S2000 series Canister Vacuum Cleaner Coaster HQRP&reg; Active Filter plus HQRP&reg; Coaster; This Active filter retains 99.97% of particles down to 0.3 micron. 100% Compatible with Original filter; 2 weeks DOA replacement warranty!