What model is your pup? Does it have a holding tank? Most of the smaller pups only have a straight pipe connecting the sink to the drain port on the sidewall of the camper. not even a P-trap under there. If you have more complex plumbing, then you might have an AAV, but only on the higher end models with toilet indoor shower. Our 1007 had only the sink/HWT/outdoor shower plumbing.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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