Compatible with Karcher A2004 MV2 NT18 NT20 NT38 WD2250 WD3.200 MV2 MV3 WD3 WD3.30 A2004 A2204 A2054 A2656. The HEPA filter can reduce the penetration of dust and other contaminants into the breathing air. Made of high-quality materials for a longer service life and very suitable for your original accessories. Installation is simple; you can install and replace it yourself. It is recommended to replace the filter every 1 to 3 months or depending on usage to maintain optimal performance of the machine. Contents: 2 filters.