This lead free reduced pressure zone assembly, 3 inch, with its exclusive design incorporates the air-in and water-out principle for protection during an emergency condition preventing 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. It can be utilized 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 lead free body, non-rising stem resilient seated gate valves, captured spring check valves, top mounted test cocks, replaceable seats, and a field reversible pressure differential relief valve.