Epson EPL-N2000 User Manual page 86

5. Align the two holes at the bottom of the Duplex Unit with
the hooks. (Arrows point to the holes.)
6. Attach the unit to the printer, making sure that the
connectors and screws on the back of the unit enter the
proper holes on the back of the printer. To avoid damaging
the unit, be careful not to let it go until you have attached the
screws.
7. Secure the unit with the two screws that came with it.
4-18 Installing Options