The Apollo 36H Pressure Reducing Valves are designed for commercial, industrial, and institutional applications to reduce incoming water pressure for protection of plumbing system components and to reduce water consumption. The valves are made with proven ASTM grade bronze and stainless steel materials. The PRH provides high capacity flow with low pressure drop. It is designed with an integral by-pass relief to protect against thermal expansion downstream. The bottom access enables easy in-line cleaning or seat replacement. Not for use with potable water systems.Sealed Spring Cage for Vault Installation Ultra-High Flow Capacity Internal Thermal Expansion Bypass Local Code Approvals Standard Factory Setting: 50 psi Three spring ranges cover 10-125 psi Stainless Steel Bolts and Spring 150 lb ANSI B16.24 Flange Connection Inline Y-Strainer100 Percent Made in the USA