The Watts 2 1/2 inch Series 957NRPDA Reduced Pressure Detector Assembly Backflow Preventer helps prevent the reverse flow of liquids due to backpressure or backsiphonage where potential health hazards exist. This assembly is designed for horizontal N pattern installation and monitors unauthorized water use, as well as providing protection against contamination in potable water systems.

Flood Detection System

• Includes a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve.
• The sensor relays a signal for notification to facility personnel, limiting flooding and costly damage.
• An add-on connection kit is required to activate the flood sensor and enable communication. Connection kit options include BMS, cellular communication, and the Sensor Control Monitor which enables integration with BAS via RS-485 Modbus or the Nexa platform through Wi-Fi.

Features

• Extremely compact design, allowing for smaller enclosures.
• Approximately 70% lighter than traditional designs.
• Housing and sleeve constructed from 304 (Schedule 40) stainless steel.
• Groove fittings allow integral pipeline adjustment.
• Patented torsion spring check provides lowest pressure loss.
• Unmatched ease of serviceability with replaceable check disc rubber.
• Includes UL Classified and FM Approved grooved gear operated butterfly valves with tamper switch.
• Bottom mounted cast stainless steel relief valve.
• Metered bypass with a cubic foot per minute meter to detect leakage or theft of water from the fire sprinkler system.

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.