This 1 inch double check valve 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 non-health hazard applications and from other contaminants found at the service line entrance. This compact modular design with a single access cover for easy maintenance is approved for horizontal and vertical installations. This assembly consists of a bronze body, gear operated slow close isolation valves, two pre-wired tamper switches, NPT end connections, two positive seating check modules and top mounted test cocks.