This is a replacement cartridge filter: Dust Collector Filter Cartridge 90 CFM – for the Cyclone DC-1500 Dust collector. Regular maintenance of your DC-1500 dust collector is essential and simple. Safely shake the filter bag and inspect. Over time, most abrasive and dust collector parts wear out. This dust collector filter cartridge works with our DC-1500 dust collector. And helps add additional protection to our dust collector filter bag. This part number is just the replacement filter cartridge.