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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.
"When we build let us think we build forever. Let it not be for present delight nor for present use alone. Let it be such work that our descendants will thank us for, and let us think, as we lay stone upon stone, that a time is to come when these stones will be held sacred because our hands have touched them, and that men will say, as they look upon the labor and wrought substance of them, "See! This our fathers did for us."
John Ruskin (1819 - 1900)