The 4" 165CI 125# W/1/8" PF from Watts Regulator Company is a high-performance water flow regulator designed for efficient pressure control. This model features a cast iron construction, ensuring durability and reliability in various applications. With a pressure rating of 125#, it is suitable for both residential and commercial systems. The 1/8" pressure fitting allows for easy integration into existing systems, while the ANSI-compliant design ensures compatibility. This regulator is engineered for easy maintenance and operation, making it a trusted choice for professionals.