4000SS-DOSY-GXF 4

This 4 inch stainless steel reduced pressure zone backflow preventer assembly is designed to prevent the reverse flow of contaminated water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. It is ideal for protection at cross-connections identified as health hazard applications and from other contaminants found at the service line entrance. This compact and short lay length design with a single access cover consists of a lightweight stainless steel body, domestic groove by flange outside stem and yoke resilient seated gate valves, spring loaded cam-check valves, pressure differential relief valve and test cocks.