Epson Stylus Pro 4000 Reference Manual page 278

4. Put your hand on the handle under the right ink
compartment, then gently pull the maintenance tank
outward.
5. Put the used maintenance tank in the plastic bag provided.
Note:
Do not tilt the used maintenance tank until after it is sealed in the
plastic bag.
6. Insert the new maintenance tank into the place.
7. If you are using 220ml ink cartridges, reinstall the removed
ink cartridges.
278
Maintenance and Transportation