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Wow okay thank you so much for all the helpful replies.

Okay I googled and figured out an aav is an air admittance valve (I know next to nothing about plumbing). Would something like this be the correct configuration? http://remodeling-projects.com/img27.jpg

We're getting a sewer smell from our washing machine drain pipe, which I'm assuming is because we need a trap. Should it be installed above the floor or is it possible/advisable to install in the crawlspace (please see pics). Also from what I've read we need a vent. Is that what is labeled in...