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Top down drawing of entire drain system. Due to space constraints can I use a 3" Elbow with a 1.5" side inlet for the Lav drain instead of the Wye and regular Elbow in the second picture? Or is there a better way? IPC is local code.

I wanted to flip the location of the toilet and vanity in our 2nd floor bathroom. I have attached a picture to show what I would like to do. Can I wet vent this system at the vanity with an AAV? Or can I vent the toilet to the existing 1 1/2” vent in the wall behind it and if so how because I...