Series 825YA Reduced Pressure Zone assemblies prevent the reverse flow of contaminated water caused by backsiphonage or backpressure from entering the potable water supply. Ideal for protection at health hazard cross-connections in water services to industrial plants, hospitals, morgues, mortuaries, and chemical plants. Applications also extend to irrigation systems, boiler feeds, water lines, and other installations requiring the highest level of mechanical protection. End connection specified NPT ANSI/ASME B1.20.1.