can I connect a new sink drain into toilet vent stack

[kat]

I want to move the sink (its currently in front the toilet too close). It's a very small bathroom from the 1940's.

 

[frodo]

yes you can...

I cant see the size pipe behind the sketch. I assume its 2''

get 2 2'' steel x 2'' plastic mission bands

and a

 

[kat]

Fantastic! (yes, the cast iron vent pipe is 2"). Is the height/placement of the T/Y connector important? (Could toilet backup into the sink if the connection is below the level of the toilet rim?)

 

[kat]

better image of the toilet vent stack

also, I did this shower drain, so I think I can do this sink drain too.

 

[pikachu4u]

Fantastic! (yes, the cast iron vent pipe is 2"). Is the height/placement of the T/Y connector important? (Could toilet backup into the sink if the connection is below the level of the toilet rim?)

No
It should not back up into sink
You are good to go with what you have planned
Good luck

 

[frodo]

19'' finish floor to center of drain, is typical rough in height for a sink with a typical cabinet or pedistal lav