Hi in the attached picture I am trying to find out what the name of this highlighted coupling/fitting is that fits smoothly against the sanitary tee and elbow. Thanks in advance!
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I always love trying to decipher why something was done the way it was done. Not normally a problem with a professional's work, but some DIYers will leave you wondering.Good question.
Maybe there was a repair, alteration, or add-on at that location.