The 8" 475DABG Reduced Pressure Detector Backflow Assembly, with grooved end butterfly valves with integral supervisory switches, is utilized in high hazard, fire protection applications to protect against both backsiphonage and backpressure. The 475DA is shaped in the n-Pattern design and is ideal for new or retrofit installations in compact spaces. The models small footprint is ideal for fire protection applications, as well as a metered bypass system to detect leaks and any unauthorized water use, saving you valuable time and money on repairs and maintenance costs.