Compatible with most Shop Vac 5 Gallon+ Wet/Dry Vacuum Cleaners(NOT FIT for 5-gallon Portable model H87S and HangUp vacuums).Compatible with Shop-Vac Type U 9030400, Type X 9035000, Type W 9034000 Cartridge Filters, Models BLB450, SSP16-500A, SSP16-600C, SS12-350A, SS14-450, SS16-SQ550, SS16-SQ650.