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 InstallationUltra-High Flow CapacityInternal Thermal Expansion BypassLocal Code ApprovalsStandard Factory Setting: 50 psiThree spring ranges cover 10-125 psiStainless Steel Bolts and Spring100 Percent Made in the USA