HP Color Inkjet cp1160 Printer series - Manual (Page 31)

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2. Insert the duplexer in the back of the printer until both sides snap into
place.
Do not press the buttons on either side of the duplexer when installing it
in the printer. Use these buttons only when removing the duplexer from
the printer.
If you encounter a problem using the duplexer, see two-sided printing
problems .
For Automatic Two-Sided Printing Module specifications, see automatic two-
sided printing module specifications .