The C9345 Ink Maintenance Box from Epson is designed for select Expression printers. This user-replaceable tank will keep your printer parts clean while maintaining optimal performance. It is responsible for storing the ink that gets flushed from the system during printhead cleaning. When capacity is getting low or the box needs to be changed, your printer & software will alert you that maintenance tank needs replaced. This box is easy to install. Accessory Type: Ink Maintenance Box; for Use With: Epson EcoTank Photo ET-8500, ET-8550, EcoTank Pro ET-16600, WorkForce EC-C7000, ST-C8000, ST-C8090, WorkForce Pro WF-7310, WF-7820, WF-7840.