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The City of Portland, Oregon

Portland Water Bureau

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Restored: Reduced Pressure Backflow Assembly

The Reduced Pressure Backflow Assembly (RPBA) is made up of two independently-acting spring-loaded check valves separated by a spring-loaded differential pressure relief valve, two shut-off valves and four test cocks. 

The reduced pressure backflow assembly is intended to be installed on service connections where backflow could pose a significant risk to health.

Link to Standardized Information for Reduced Pressure Backflow Assemblies