Premium T812xl320-S (Epson T812) Magenta Inkjet Cartridge fully compatible with the Epson WorkForce EC-C70000, WF-7820, WF-7840. The use of compatible supplies does not void your printer warranty. (T812xl320-S, Epson T812, T812xl320S, EpsonT812, T812XL, T812XL320)