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Upstairs the tub drain has about 1 1/2 inches of pipe then it tees to the incoming tub overflow pipe then it goes under floor so I have no room for an AAV vent there. The two bathroom sink drains tie into the drain shortly after it goes under the floor. If I added an AAV under one of the sinks...

I replaced all the galvanized with PVC and that hodgepodge of fittings is now a straight shot. Just below the edge of the photo the 1 1/2 " vertical pipe goes to 2" then joins the 3'' pipe next to it which then joins with the other 3"pipe. I plan to put a clean out in the 2" section.

I'm pretty new to plumbing, certainly in a house built in 1910. A previous owner had redone the drain system using a mix of the galvanized pipe and PVC, with no real venting unless you count the overflow on the tub. Two upstairs sinks share the same 1 1/2" drain line .Recently the upstairs tub...