The answer to 'what causes pressure regulator' is a pressure regulator is a device that controls the water pressure in a home's plumbing system. It is installed on the main water supply line and helps maintain a consistent, safe water pressure throughout the home. The pressure regulator reduces the incoming water pressure to a lower, more manageable level, typically between 40-80 PSI.
Pressure regulators are necessary because the water pressure from the municipal supply can often be too high for a home's plumbing system, which can lead to leaks, burst pipes, and damage to appliances. By keeping the water pressure within the optimal range, the pressure regulator helps protect the plumbing and prevent costly repairs.