Apollo 36C Series Pressure Reducing Valves are designed to protect non-potable water distribution systems by automatically controlling excessive pressure changes. The valves integral thermoplastic cage provides maximum corrosion resistance. Designed for easy in-line servicing with bottom cleanout access to seat disc and strainer.Balanced Piston Design Sealed Spring Cage Vault SS Adjusting Screw and Nut Built-in Thermal Expansion By-Pass Easy Access to Seat Disc and SS Strainer Factory Preset to 50 psi (-01) Control Pressure Ranges:10-35 psi, 25-75 psi (standard), 75-125 psi100 Percent Manufactured in USA