The Epson maintenance box for the WorkForce WF-4720 is the part that collects waste ink from the printer's cleaning cycles. Every inkjet flushes a small amount of ink through the printhead to keep the nozzles clear, and that ink has to go somewhere; the maintenance box is where it ends up.When the box fills, the printer stops and asks for a replacement. Fitting a new one clears the message and returns the machine to service, which is why it is worth having a spare before the printer asks rather than after.The box is a user replaceable part, so no service call is needed. Browse more Epson ink and consumables, or see the wider consumables range. Specification Detail Part type Genuine Epson maintenance box Function Collects waste ink from cleaning cycles Printer Epson WorkForce WF-4720 Product code E6715 Frequently asked questions What does a maintenance box do?It collects the waste ink the printer flushes through the printhead during cleaning cycles.Can I replace it myself?Yes. The maintenance box is a user replaceable part.