This 3 inch Watts Series 957RPDA Reduced Pressure Detector Assembly is designed to protect potable water systems from contamination caused by backpressure or backsiphonage, particularly in health hazard applications. It also monitors unauthorized water use from fire protection systems.

Construction & Design

• Features an extremely compact design that is 70% lighter than traditional designs.
• Housing and sleeve are constructed from 304 (Schedule 40) stainless steel for corrosion resistance.
• Includes two independent torsion spring check modules and a differential pressure relief valve.
• Equipped with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves.
• A bottom mounted cast stainless steel relief valve is included.
• Features a cubic feet per minute (CFM) meter in the bypass line to detect underground leaks and unauthorized water use.

Flood Sensor Technology

• Integrates a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
• The sensor relays a signal to facility personnel for corrective action, helping to limit flooding and costly damage.
• To activate flood monitoring and alerts, an add-on sensor connection kit is required.
• Connection kit options include BMS, cellular communication, or the Sensor Control Monitor, enabling integration with Building Automation Systems (BAS) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.

A WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing standard material product, consult your local water authority, building and plumbing codes.