The Watts Regulator LF777SI is a 1 1/2" pressure regulator designed for high-efficiency water systems. This model features a lead-free brass construction, ensuring compliance with safety standards. It operates effectively within a pressure range of 10-125 PSI, making it suitable for various applications including irrigation and industrial use. The LF777SI is equipped with a built-in strainer to prevent debris from affecting performance, and its compact design allows for easy installation. This regulator is a reliable choice for maintaining consistent water pressure in demanding environments.