Epson EPL-N3000 Reference Manual page 210

Note:
Keep the duplex unit connector cover in a safe place prevent to lose.
3. Install the Duplex Unit as shown below. Make sure that the
unit hooks onto the printer's tabs and the duplex connector
goes into the slot.
4. Secure the unit with the two screws provided.
5. Reconnect the interface cable and power cord, then turn the
printer on.
Installing Options
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