No. of Recommendations: 5
Mystery solved :)

I have an answer from the seller... a couple of you hit the nail on the head, and several others were very close... I well should have expected it of you guys :)

The answer is... it goes to a no-longer used sprinkler system, AND also once a water softener. I don't know where it's rushing to now... perhaps it just feeds back to the sewer or something. But that is indeed the answer.

The seller also answered a couple questions about how to shutoff the outdoor water, and how to turn on that outdoor spigot I couldn't figure out. By trial and error I got that to work.

But while I figured that out, it actually confused the heck out of me for a while in the big picture. Why? Well I reference you back to the picture:

The pipe at the bottom is indeed the main house in feed. The ball valve pipe in the middle is the old-sprinkler. And the pipe up top is the front yard spigot. I proved all that by example. So then, where the heck does the rest of the house water go??

The pipe that continues up just comes down as that rightmost green pipe to that old washer hookup and goes nowhere... or so I thought!

Actually you can see that little device just under that top shelf of the bookcase there (I have no idea if that type of valve/hookup has a name - it appears to say "cul flo valv" on it). The water must go through that, and then back up the leftmost green pipe. From there I can trace it to the rest of the house.

While that looks like it was originally hot & cold water for a washer (or sink?) at some point, it appears to have been repurposed. I'm not sure why you'd do that rather than hook those pipes together up top where they cross anyway - must have been cheaper or easier.

Anyway, yay, I am englightened :)
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