How to tie into this main stack for small wet bar sink
I have a wet bar sink that I am putting in the basement. I have the hot and cold water lines all ready to go but I am now stumped as to how to connect my sink drain to this 4" inch waste stack.
This sink is in my basement. The 4" line that you see below is a waste stack for my upper floors. It is one of two stacks that I have in my basement.
1) how can I tie into this stack for a waste line from my sink that I want to put in?
2) my sink is going to be right next to this 4" waste line. Will I need a Air Admittance Valve?
NOTE: My sink will be to the right of my supply lines and to the left of that vertical soffit that the 4" waste from upper floors is located.
Here are some pics: