Need all your blessing for this Back to back sink vent

[TreehouseGal]

Hi! I read many posts on back to back sinks and I think my situation is going to be more straightforward. I just need your blessing.
Trying to add a little bar sink behind the wall of a powder room Vanity sink.
Single story ranch with venting pipe, going straight to the roof.
Opened up the wall today. Happy to have the bar sink positioned right behind the vent and the water plumbing.

So plan: use back to back Double Fixture Tee

 

[Jeff H Young]

I havent seen a 1 1/2" double fixture fitting didnt know they made them

 

[Sponsor]

 

[Breplum]

The drain part would have to be full two inch. Not a double tee, a double fixture tee, know in the trade as a figure 5 fitting.
2 x 1.5 x 1.5 x 1.5

 

[Jeff H Young]

Id add a santee to the w/c vent a 2x2x11/2. a 1 1/2" pipe can pick up a bar sink and lav but I dont know of a proper fitting made in 1 1/2" to convieniently use. thats why Id wet vent off the toilet vent

 

[TreehouseGal]

Oh…. So you would use a single saniTee on the toilet vent!!!!! Thats even better!!!
Thank u guys~

 

[Jeff H Young]

Thats how Id do it . you might even want to move sink a little or point san tee in the wall toward the other stack and just 90 out the wall.