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The existing bathroom venting/piping is not going to be changed in location, or sizing. The kitchen sink has its own 2" vent as well The new bathroom. In order to add the vent, the only two ways I can come up with, without dropping below the joist line, are to run the street elbow from the...

I am trying to make sure I correctly connect 3" drain pipes that I am re-running in my house. On a 3" drain line that is running horizontal, can I use a 45 elbow at an angle and connect that line with the main stack with a "Y" fitting. Also can I use medium turn 90's in the waste line, or do...