HP Color Inkjet cp1160 Printer series - Manual (Page 67)

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automatic two-sided printing
To print two-sided documents automatically, the duplexer must be attached
to the printer.
The duplexer only works with certain media types. For a list of supported
media types, see
duplexer media types .
If you want to print a two-sided document on a media type not supported by
the duplexer, see
manual two-sided printing .
printing instructions
Follow these instructions to print a two-sided document:
1. Open the Print dialog box, then select the Layout panel.
2. Select Print Both Sides .
3. Select Automatic .