Any idea what the device below the main shut off valve is? If you look closely to the right (on the close-up) there is what looks like a valve adjustment that has been partially grouted over. This is a friends house and she has extremely high water pressure (130psi). I was wondering if it was some kind of old regulator. I don’t want to have her spend money getting a regulator installed if this device can be adjusted to lower pressure.
By the way notice that nice piping job by the plumber off the valve (reduced down to 1/2")