This 4 inch reduced pressure detector backflow preventer assembly helps stop the reverse flow of liquids due to backpressure or backsiphonage, where a potential health hazard exists. It is extremely compact and lighter than traditional designs, approved for horizontal installation.

This assembly features a stainless steel body with a quick access sleeve, torsion spring check valves, and resilient seated gate valves with outside stem and yoke (OSY) shutoffs. It also includes test cocks, a corrosive-resistant bottom mounted pressure relief valve, and a cubic feet per minute meter to detect underground leaks and unauthorized water use.

Flood Detection & Alerting

• Equipped with a flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
• When paired with an add-on sensor connection kit (sold separately), the sensor is activated to relay alerts for potential flooding events.
• 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.

Design & Performance

• Extremely compact design, 70% lighter than traditional designs.
• Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for corrosion resistance.
• Groove fittings allow integral pipeline adjustment and simplify check access for serviceability.
• Patented torsion spring check provides the lowest pressure loss.
• Replaceable check disc rubber for easy maintenance.
• Metered bypass system detects leakage or theft of water from the fire sprinkler system.

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, consult your local water authority, building, and plumbing codes.