What would be the best way to put a 45 degree tee in the copper piping in the picture below? That pipe is where the kitchen sink upstairs drains into and also continues through the attic and roof to serve as a vent. I believe it's 3 inch copper. Would I remove a larger than necessary portion and install ABS piping with rubber couplings? Then put a ABS tee in? Or could I just get a rubber coupling that is a tee and install that?
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