These printers use the T043120 (High Capacity) cartridge:
Click On a Printer to View it's Cartridges
Epson CX 6400
Epson Stylus C-84
Epson Stylus C-84 N
Epson Stylus C-84 WIFI
Epson Stylus C-84 WN
Epson Stylus C-86
Epson Stylus CX-6400
Epson Stylus CX-6600