Pictured are pipes entering my slab in the wall behind my water heater. The wall has cellulose insulation in it, so I can't see, but my best guess is that there is a manifold in the wall there. The leaking pipe in question exits about 20 feet away, but is a half inch pipe, these are 3/4".
Should I be looking for a secondary manifold, or could there just be a reducer or tee in the slab? My stepdad taught me not to put fittings under concrete, but I can't say it's never been done. The house was custom built in 1983, so I have no experience with the conventions and code s of the time, being born in 85.
I want to simply cut and cap the leaking pipe before it enters the slab. It's just stubbed out on the other end.
My plan: Place a shark bite hose fitting on the end of the leaking pipe, run a house out the window. Turn on the water heater, and crack the valve and see which pipe heats up.
At that point, I will cut the water, cut that pipe, put a valve on it, shut the valve and turn on the water again. If any taps are missing hot water, I can run a new PEX drop to those fixtures.