Solving for a problem that should not be my problem
It is a long story but this device is preventing my house water system from being over pressurized from a recently installed public water system. Yes there is a pressure regulator out at the street and yes it has been replaced once, but they have not fully worked properly. This adjustable device will allow me to set at a reasonable pressure and forget it. So far it has been working great. House pressure set for 50psi, relief valve set at 70psi, no more huge spikes in water pressure.