I looked up your printer model and the duplexer looks like it’s built into the unit. 

On Mon, Sep 24, 2018 at 2:43 PM Anthony Radzykewycz <anthony.radzykewycz@gatewaycc.edu> wrote:

A duplexer is an attachment that enables the capability for double-sided printing. Different makes/models will look different, of course, but my HP4150 is larger in the back, since the duplexer is installed. Each add-on is important to identify on install since it may change the exact driver you use. It was a common problem that I saw years ago where a user could not print on both sides due to a generic driver being used.

On Mon, Sep 24, 2018 at 2:40 PM Michael <bmike1@gmail.com> wrote:

I got a new printer(HP Envy Photo 7855). It asked me if I had a duplexer. I'm sure I don't have one but what is it and how would I know if one is installed?

--

:-)~MIKE~(-:

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