6.415-953.0 2pcs Flap Filter Fit for Karcher AD2 AD3 AD4 Premium AD3.000 AD3.200 - AliExpress
Kärcher 1.629-711.0 AD 2 Axial and dry vacuum cleaner
KARCHER flat Wave Filter - 6.415-953.0 - OX.ee
Amazon.com - Spare Filter, Compatible for Karcher 6.415-953.0 AD 2 AD 3.000 AD 3.200 AD 3 AD 4 Robot Vacuum Cleaner Spare Part Replacement (Color : 2pcs Filter Kit)