Size:1" Zurn Wilkins 1" Pressure Reducing Valve, Lead-Free, FNPT Union x FNPT (Only One Union is Included. If two unions are needed, Please order Zurn 1-NR3XLDU). Designed for installation on potable water lines to reduce high inlet pressure to a lower outlet pressure. The integral strainer makes this device most suitable for residential and commercial water systems that require frequent cleaning of sediment and debris. The direct acting integral by-pass design prevents buildup of excessive system pressure caused by thermal expansion. The balance piston design enables the regulator to react in a smooth and responsive manner to changes in system flow demand, while at the same time, providing protection from inlet pressure changes