These printers use the T612800 cartridge:

Epson Stylus Pro 7800

Epson Stylus Pro 7800 Professional

Epson Stylus Pro 7880 ColorBURST Wide Format

Epson Stylus Pro 7880 Wide Format

Epson Stylus Pro 9800

Epson Stylus Pro 9800 Professional

Epson Stylus Pro 9880 ColorBURST Wide Format

Epson Stylus Pro 9880 Wide Format