The Watts B911S - 1/2" Sweat Combo Backflow Preventer & Pressure Reducing Valve (0386462) is a high-quality plumbing component designed to regulate water pressure and prevent backflow contamination in residential and commercial applications. This dual-function valve ensures a consistent and safe water supply by automatically reducing incoming water pressure to a desired level while al... https://www.partshnc.com/b911s-watts-12--sweat-combo-back-flow-preventer-pressure-reducing-valve-0386462-replaces