These printers use the KXFAT88 cartridge:
Click On a Printer to View it's Cartridges
          Panasonic KX FL-401
          Panasonic KX FL-402
          Panasonic KX FL-403
          Panasonic KX FL-411
          Panasonic KX FL-412
          Panasonic KX FL-413
          Panasonic KX FL-421
          Panasonic KX FL-423