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 DesignSealed Spring Cage VaultSS Adjusting Screw and NutBuilt-in Thermal Expansion By-PassEasy Access to Seat Disc and SS StrainerFactory Preset to 50 psi (-01)Control Pressure Ranges:10-35 psi, 25-75 psi (standard), 75-125 psi100 Percent Manufactured in USA