HQRP 2 Foam Filter Sleeves for Shop-Vac 90L400 90L500 90L500A 90L550A 90L600 90L600A 90L600C 90L650A 90L650C 90LN550A 90LN650C 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!