Series 909 Reduced Pressure Detector Assemblies
SIZE RANGE: 2½" through 10".
Series 909RPDA Reduced Pressure Detector Assemblies are designed exclusively for use in accordance with water utility authority containment requirements on health hazard applications. It is mandatory to prevent the reverse flow of fire protection system substances, i.e., glycerin wetting agents, stagnant water and water of non-potable quality, from being pumped or siphoned into the potable water line..
Pressure / Temperature
Temperature Range: 33°F – 140°F (5°C – 60°C) continuous
Maximum Working Pressure: 175psi (12.06 bars)
909RPDA Data Sheet (pdf)

Series 994 Reduced Pressure Detector Assemblies
SIZE RANGE: 2½" through 6"
Series 994RPDA Reduced Pressure Detector Assemblies are designed for use in accordance with water authority-containment programs. This series is normally used in health hazard applications to protect against backsiphonage and backpressure. This series can be used to prevent the reverse flow of fire protection substances, i.e., glycerin wetting agents, foam agents, stagnant water, auxiliary supplies and water of non-potable quality from being pumped or siphoned into the potable water supply.
Pressure / Temperature
Temperature Range: 33°F – 110°F (5°C – 43°C) continuous
Maximum Working Pressure: 175psi (12.06 bars)
994RPDA Data Sheet (pdf)

SIZE RANGE: 2½" through 10".
Watts SilverEagle Series are the lightest and most compact backflow prevention assemblies in the industry.
Series 957/957N/957Z Reduced Pressure Zone Assemblies provide protection to the potable water system from contamination in accordance with national plumbing codes. Series 957/957N/957Z are normally used in health hazard applications for protection against backsiphonage or backpressure.

Pressure / Temperature
Temperature Range: 33°F – 140°F (5°C – 60°C)
Maximum Working Pressure: 175psi (12.06 bars)

957RPDA Data Sheet (pdf)