Here is where it enters into the 3" below
Thanks.. that was my thought... I am doing away with the ABS...Where is the clog occurring? I would change that S trap to a P trap and install an AAV.
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Connecting to a horizontal pipe in the basement:
Going in the top a sanitary tee is ok.
Going in the side a wye is needed and a 45 if necessary.
Going in at a 45 degree angle, 45 or less is a wye, over 45 to 90 is a sanitary tee.