Possibly flawed. I didn't ask my neighbor about the regulator, which I am almost positive she doesn't know anything. I was just going over to verify if my newly purchased water pressure gauge works. In any case, I believe I now have a working xpan tank. I am not sure if I need to replace the regulator or not. Note both my outside spigot and inside water heater drain valve are behind the regulator, and I learned from this thread that with a working xpan tank, the pressure reading of 130 at both valves should therefore be normal, right? I just need to know if I should pump the xpan tank from pre-charged 40 to 65. Thanks again for everyone's help.