There are no pictures on your post and the information you provided didn't show up for anything when I looked for it, not even when I searched Nissan for an OEM part, which is why I said that maybe some more information would be a good idea.
I have the same vehicle as you do down to the trim level (SE) and looking through the manual at the cross-section of the CVT system, the only pump I found associated with the transmission is the oil pump but that doesn't come across to me as what you are looking for.
Maybe you would have better luck getting a transmission from a scrap yard and pulling the part you need that way. Good luck, hopefully you'll get the answer you are looking for.