HQRP Dry Flat Filter compatible with Karcher 6.904-367.0, 6.907-012.0 fits KM 70/30 C Bp, NT 20/1 Ap, NT 35/1 Ap, NT 35/1 Tact, NT 45/1 Tact, NT 361 ECO, NT 561 ECO, NT611 ECO Vacuum Cleaners - Walmart.com
Kärcher 6.904-208 Paper Filter Pockets 6.904-208 NT 561/611+45/1+55/1 Pack of 5 - - Amazon.com