Epson WF-3520 3530 3540 3640 4010 4020 4023 4090 4520 4530 4533 4540 4590 4630 4640 5110 5190 5620 5690 Ink Maintenance Box. The T6710(00) Ink Maintenance Box stores ink that gets flushed from the system during print head cleaning. Your printer and its software will let you know when the maintenance box needs to be replaced .Epson WF-3520 3530 3540 3640 4010 4020 4023 4090 4520 4530 4533 4540 4590 4630 4640 5110 5190 5620 5690 Ink Maintenance Box. OEM Ink Parts.