HQRP Foam Filter Sleeve for Shop-Vac 4020, 4025, 4025B, 4030, 4030H, 4040H, 4045, 4045A, 464B, 464D, 8040, 8045, 8045A, 8050A 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!