These printers use the T522420-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