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I think #7 should just be a TEE with three pieces of copper and you make all three joints, one flat, one overhead, and one horizontal with the piece set in the vise so the run is vertical and the bull of the TEE is horizontal.
I don't see any added benefit to the coupling unless it is a slip coupling and it is soldered in a riser.
"It's a table saw, do you know where your fingers are?" Bob D. 2006