For example, if a regulator is chosen for a capacity (C) at 2-psi drop, it should control well at a capacity of 0.15 C at the same 2-psi drop. However, at tight loads, the pressure drop presented by ...

Pressure regulators ... of less than 0.04 psi are called for. Pistons, on the other hand, are more rugged and provide a larger effective sensing area for a given size regulator.

Then, install your pressure gauge on an exterior faucet, turn on the faucet and read the pressure. Your home’s water pressure should be between 40 and 80 psi (pounds per square inch).