The Retro-Regulator In-Stem Pressure Regulator with Check Valve 30/40 PSI is a high-quality pressure regulation device designed for precise control and reliable performance. This regulator features a retro design that seamlessly integrates into existing plumbing systems, making it ideal for retrofits and upgrades. With a pressure range of 30 to 40 PSI, it ensures consistent and accurate water pressure throughout the system. The built-in check valve prevents backflow, providing added safety and protection. Whether for residential or commercial applications, this pressure regulator offers exceptional durability, efficiency, and peace of mind.