The Watts 6 inch Series 957 Reduced Pressure Zone (RPZ) Backflow Preventer with SentryPlus Alert® flood sensor provides critical protection against backpressure and backsiphonage in potable water systems, suitable for health hazard applications. Its compact design features 304 stainless steel housing, grooved gear operated butterfly valves with tamper switches, and a Lead Free* bronze body. The integrated flood sensor detects excessive discharges, relaying alerts when paired with an add-on connection kit. Approved by AWWA, ASSE, CSA, CULUS, FM, and NSF, this Z-pattern assembly handles up to 175 psi and operates between 33°F and 140°F, ensuring reliable performance and ease of serviceability.
Help Me Connect
Connections
This backflow preventer features groove couplings for ease of installation and integral pipeline adjustment.
For flood sensor activation, an add-on connection kit is required. These kits support compatibility with BMS (Building Management Systems) and cellular network communication.
The optional Sensor Control Monitor enables integration with BAS (Building Automation Systems) via RS-485 Modbus or the Nexa® platform through Wi-Fi connectivity.
When installing a drain line, use 957AG air gaps and attach the air gap brackets directly onto the flood sensor.
This 6 inch reduced pressure zone assembly backflow preventer helps protect the potable water system from contamination by preventing the reverse flow of liquids due to backpressure or backsiphonage, especially in health hazard applications. Its extremely compact design, 304 (Schedule 40) stainless steel housing and sleeve, and grooved gear operated butterfly valves with tamper switch make it a reliable and serviceable solution for water system protection.
Construction & Design
Features a 304 (Schedule 40) stainless steel housing and sleeve for durability.
Equipped with two independent torsion spring check modules with replaceable elastomer discs (EPDM, silicone, or Buna-N).
Includes a bottom mounted cast stainless steel relief valve.
Grooved gear operated butterfly valves with tamper switch for shutoff and monitoring.
Lead Free* bronze body for test cocks.
Groove couplings facilitate ease of installation and pipe alignment.
Extremely compact design, up to 70% lighter than traditional designs, allowing for smaller enclosures.
Designed for Z-pattern orientation and approved for horizontal installation.
Flood Detection & Alerts
Integrated flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve.
When paired with an add-on connection kit, the sensor activates to relay alerts for potential flooding events to facility personnel, helping to limit damage.
Connection kit options include compatibility with BMS, cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.
Important: An add-on connection kit is required to activate the flood sensor for communication; without it, the sensor is a passive component. The flood sensor does not replace the need for proper drainage or compliance with all installation, operation, and maintenance instructions and codes.
Specifications
Size: 6 inch
Assembly Type: Reduced Pressure Zone (RPZ) Backflow Preventer
Orientation: Z-pattern, Horizontal Installation
Lead Free: Wetted surfaces contain less than 0.25% lead by weight
What is the primary function of this Watts Series 957 backflow preventer?
This 6 inch Reduced Pressure Zone (RPZ) assembly protects the potable water system from contamination caused by backpressure or backsiphonage, especially in health hazard applications.
Does this backflow preventer include a flood sensor?
Yes, it includes an integrated flood sensor with SentryPlus Alert® technology to detect excessive water discharges from the relief valve. An add-on connection kit is required to activate its communication features.
What material is the housing of this assembly made from?
The housing and sleeve are constructed from durable 304 (Schedule 40) stainless steel, offering robust performance and corrosion resistance.
What are the main types of connections for this backflow preventer?
This assembly utilizes groove couplings for straightforward installation and pipeline alignment. The flood sensor can connect via BMS, cellular communication, or through a Sensor Control Monitor for BAS integration via RS-485 Modbus or Wi-Fi to the Nexa® platform.
What is the maximum operating pressure and temperature range for this unit?
It is designed to operate with a maximum working pressure of 175 psi (12.1 bar) and a temperature range of 33°F to 140°F (0.5°C to 60°C).
