I have a tight space in which I need to install an air admittance valve (AAV). The below image shows the back of the wall behind my bathroom sink that is competing with my nearby tub drain to see who can suck out the other's p-trap faster.
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From my review of IRC P3114, my options seem very limited. In an ideal world, the drain would take a 90 down so that I could replace it with a tee wye and pop an AAV on top (at least 4 inches above horizontal) and call it a day....
AAV Recommendations for a Tight Space
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