With advanced printers like your Epson Workforce Pro machine, you need more than ink cartridges to ensure its continued operation. You also need essential maintenance items like the original Epson T6715 Maintenance Box. Why entrust the running of the WF-4730DTWF (and all other compatible printers) to anything but a genuine Epson C13T671500. Products produced by the manufacturer of your printer work flawlessly with your machine and the Epson T6715 maintenance box lives up to the companies reputation. If however you should ever have any problems with the C13T671500 maintenance box, Epson offer a direct warranty, but this is very rarely needed.