As part of the 3-stage filter system with cyclone, air intake and HEPA or sponge filter (dependent on your device), the air inlet filter separates finer particles from the air during vacuuming, before the air is then cleaned again by the exhaust filter. Karcher recommend regular cleaning of the air inlet filter through tapping off the accumulated dust and by using the Karcher filter cleaning tool, ensuring exhaust and ambient air remains clean. This air inlet filter is compatible with the Karcher VC 4 Cordless, VC 6 Cordless and VC 7 Cordless vacuum cleaners. Genuine Karcher part. Specifications • Karcher Part No: 2.863-319.0