This 8" stainless steel double check detector backflow preventer is a crucial component in safeguarding potable water from contamination. Used primarily in fire line sprinkler systems where it prevents the backflow of fire suppression materials into the potable water supply, its installation is typically mandated by local authorities in areas identified as non-health hazard continuous pressure applications. It has outside stem and yoke resilient seated gate valves and a gallons per minute meter that measures water to detect unauthorized water usage and ground leaks. The post indicator valve allows for easy visual confirmation if the valve is open or closed.