HQRP Foam & Felt Filter Kit for Shark XFF350 Navigator Lift-Away Upright 609722030137 Replacement plus Coaster HQRP Foam and Felt Pre-Filter Replacement; These filters are located exactly below the dust cup and protect the motor from any debris going into it; Do not operate the vacuum with wet filters; 100% Compatible with Original filter; 2 weeks DOA replacement warranty!