The 10" 475DA Reduced Pressure Detector Backflow Assembly, with OS&Y gate valves and metered bypass 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.