Double Sanitary Tee

[tpsmith82]

I was working on the DWVset up at my cabin and it dawned on me I might be able to use a double sanitary tee. Question is, cani I use a vertical sanitary tee in this orientation.

Basically top connection will be from small bath sink
Bottom connection goes to one of the main 3" drain lines
Then the horizontal connections are a vent for the Shower on the "up stream side" and then the toilet and bath sink on the "down stream side"

Thanks

 

[Terry]

Venting goes up not sidewise.
The lav needs venting.