These printers use the T522120-S cartridge:

Epson EcoTank ET 4700

Epson EcoTank ET-2400

Epson EcoTank ET 2710

Epson EcoTank ET-2800

Epson EcoTank ET-2803

Epson EcoTank ET-2840

Epson EcoTank ET-4800

Epson EcoTank ET 2720