This 3 inch lead free double check valve assembly is designed to prevent the backflow 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 aids in easy maintenance with a single access cover for in-line repairs. It is ideal for protection in continuous pressure piping applications and at cross-connections identified as non-health hazards and for contaminants at the service line entrance. This assembly consists of a fused epoxy coated cast iron body, UL and FM outside stem and yoke resilient seated gate valves, two in-line independent positive seating check modules, top mounted test cocks, replaceable check discs and seats, and captured springs.