This cartridge filter makes it possible to vacuum without requiring an additional filter change. The filter can be easily attached and removed by twisting it. No additional locking elements are required. In addition, the filter ensures excellent dust retention. Genuine Karcher part. Compatible with the following Karcher Machines (may also be suitable for models introduced after this list was compiled) • SE 4001 • WD 1 Battery Set • WD 2 Plus • WD 3 Specifications • Karcher Part No: 2.863-303.0