This 6 inch Series 957NRPDA Reduced Pressure Detector Assembly provides essential protection for potable water systems against contamination from back-siphonage and backpressure. It is also designed to monitor for unauthorized water use within fire protection systems and features an integrated flood sensor.

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.

Construction & Design

• Features an extremely compact design, making it 70% lighter than traditional models
• Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability
• Groove fittings allow for integral pipeline adjustment and ease of serviceability
• Equipped with a metered bypass to detect leakage or theft of water from the fire sprinkler system
• Includes a gallon per minute meter (GPM)
• Features a bottom mounted cast stainless steel relief valve

Valve Technology

• Two independent torsion spring check modules provide lowest pressure loss
• Reversible check disc rubber for extended lifespan
• Furnished with UL Classified and FM Approved outside stem and yoke (OSY) resilient seated gate valves

Flood Detection & Connectivity

• Integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve
• Sensor relays a signal to facility personnel for corrective action, limiting flooding and costly damage
• Flood alert feature is activated with an add-on sensor connection kit (sold separately)
• Compatible with BMS and cellular network communication
• Integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity is possible with the Sensor Control Monitor (sold separately)