With advanced printers like your Epson EcoTank/WorkForce/Expression machine, you need more than simple ink cartridges to ensure its continued operation. You also need essential maintenance items like the original Epson T04D1 maintenance box.Why entrust the running of the ET-M1140 (and all other compatible printers) to anything but a genuine Epson C13T04D100. Products produced by the manufacturer of your printer work flawlessly with your machine and the Epson C13T04D100 Maintenance Box lives up to the companies reputation.If however you should ever have any problems with the T04D1 Maintenance Box, Epson offer a direct warranty, but this is very rarely needed.