4000B-S 1/2

This 1/2 inch reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. Its compact modular design facilitates easy maintenance with a single access cover for in-line repairs. It can be used in a variety of installations without the need of any special tools. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as health hazards and from other contaminants found at the service line entrance. This assembly consists of a bronze body construction, strainer, quarter turn ball valve shutoffs with tee handles, NPT end connections, top mounted test cocks, captured springs, two in-line independent check valves, replaceable check seats, and an internal relief valve for reduced space requirements.