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  • 7
    Ah ok, I guess this makes sense. So it could be sort of a "manifold" where the main water lines are branched out, and it's above ground to avoid corrosion? This seems plausible, so I'll accept this answer! Commented Jul 26, 2021 at 0:51
  • 2
    I may be missing something here, but I don't really see how this answers the question.. it's not known whether or not the sweated joints are in contact with soil or not, and the question was whether or not a tub faucet could be connected here. Commented Jul 26, 2021 at 18:53
  • @cutrightjm it answers the first question of "why 7?" by telling me they are normal supply lines, which kind of answers the 2nd question I had. Commented Jul 26, 2021 at 19:54
  • 2
    @Wayne Conrad, the copper tubing used under slabs is soft and is bent into a gentle curve to go from horizontal to vertical to come out of the slab. This tubing comes on long rolls, just like refrigeration grade copper tubing. In new construction there are no joints or fittings of any kind under a slab. Above the slab the copper tubing is hard, unbendable copper connected traditionally by fittings "sweated" tin-copper or other solder. Commented Jul 27, 2021 at 0:44
  • 1
    Probably the right is hot and the left is cold, feeding the sink, shower, and the 3rd cold is for the toilet. There was a bit of artistry involved with the 3/4" feeds spaced perfectly to allow an evenly spaced out-to-in flow of the pipes. You have to respect that. You're going to ruin the feng shui by adding more pipes in some random boorish direction of your choosing. :) Commented Jul 27, 2021 at 22:23