The answer to 'what is pressure regulator' is a device that controls and maintains the water pressure in a plumbing system. Pressure regulators are installed on the main water supply line to a home, typically near the water meter or main shut-off valve. They are designed to reduce the high pressure from the municipal water supply to a lower, more manageable pressure that is safe and optimal for the home's plumbing system and appliances.
Pressure regulators help prevent damage to pipes, fixtures, and appliances that can occur from excessively high water pressure. They ensure a consistent, steady flow of water throughout the home and help improve the efficiency and lifespan of water-using devices like washing machines, dishwashers, and water heaters.