These printers use the UG-5510 cartridge:

Panasonic DX 800

Panasonic PanaFax DX-800

Panasonic PanaFax UF-780

Panasonic PanaFax UF-790

Panasonic PanaFax UF-6000

Panasonic UF 790

Panasonic UF 800

Panasonic UF 6000