Note: We recommend that you replace the 90304 vacuum cleaners filter every 3-6 months In order to maintain the best of the vacuum cleaners, it is recommended that you replace it according to the frequency of use The 90304 can effectively filter everyday dirt such as dryer lint Providing you with a clean and freshly environment Suitable for Cartridge 90304, 90350, 90333, Type U 9030400, Type X 9035000, Type W 9034000, models BLB450, SSP16-500A, SSP16-600C, SS12-350A, SS14-450, SS16-SQ550, SS16-SQ650, 86MTSQ550, fit for 90340 SL16-575A SS11-450 SS12-300A SS14-350A SS14-550A SS14-600C 16RT500A for Wet or Dry Pickup Please check the model number of your machine before purchasing : It ' s and fits for 5 Gallon and up Just remove the 90304 filter, put the new 90304 filter back in place to quickly restores cleaning The high efficiency 90304 are make of washable and ABS, designed for better filtering of debris and longer service life