What is a water pressure regulator?

A water pressure regulator is a safety feature designed to prevent the water pressure inside your home from climbing too high or falling too low. Building codes require builders to install a water pressure regulator on homes when the street mainline pressure exceeds 80 psi (pounds per square inch). Most regulators are pre-set by manufacturers at 50 to 60 psi, which is the optimal pressure.

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1. What is a water pressure regulator?
2. Where is the pressure regulator located?
3. How do I adjust my pressure regulator?