AAV for a double sink on a central outlet

[Taki]

Hello,

I have a double sink installed on a central outlet with a single trap (see the attached image) generating awful stench. I am assuming the trap is getting dried up. With no possibility to open the wall and fix it by venting separately, I was thinking to add an AAV to solve the venting/smell issue. Due to space restriction, I can add an AAV in two places as marked on the image: AAV1 would be best, but if that placement is wrong, I can try and install it on center (AAV2).

Would appreciate feedback and whether it would solve the problem.

Thanks!

 

[Terry]

Neither of those locations will do anything.
Any venting takes place after the p-trap, not before it.

 

[Sponsor]

 

[Taki]

Neither of those locations will do anything.
Any venting takes place after the p-trap, not before it.

Of course, silly me. Thanks.

Would an AAV after the trap help in this situation?

 

[Terry]

You might have a vent in the wall already. But yes, after the p-trap.

 

[Taki]

There is a drain in the wall, and i suspect it's blocked, maybe partially. This is a second floor, and when one of the toilets is flushed, there's some gurgling in another one in the same area.
I don't know how to check if the vent if properly open, so I guess I'll wait until spring to go on the roof and snake.

I appreciate the advice.