HQRP Foam Filter Sleeve for Shop-Vac 85L250B, 85L350, 85L400, 85L450, 85L500, 85L550, 85L575, 85L600, 85M300, 85S200, 86S150, 86S200 Wet Dry Vacuums + Coaster HQRP&reg; Foam Filter Sleeve + HQRP&reg; Coaster; Use on filter cage for vacuuming water, for picking up wet messes when used alone. Also required when using reusable disc style filters. Replaces Shop-Vac Foam Filter Sleeve Part # 9058500 / 905-85-00 / 90585. Required unless you are using a cartridge filter. 100% Compatible with Original filter. 2 weeks DOA replacement warranty!