The Nissan Path

Hopefully this will be my last question for a little while. While reinstalling the plenum, I noticed a valve/nipple on the back of it. I don't remember a hose attaching to it. I changed the pcv hose going from the side to the valve cover, but cant figure out the one on the back. Does something attach to it?

A picture would help. Try this link below and see if helps:

http://www.nissanpartszone.com/Page_Pro ... &PageName=