2.5 957-DNRS-FS

Item Number: F792319
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$12,239.63
Special Order
When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Reduced Pressure Zone Assembly Backflow Preventer
  • Weight: 202.0 lb
  • Size: 2 1/2 inch
  • Shutoff Valves: Domestic NRS Resilient Seated Gate
  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Flood Sensor: SentryPlus Alert Technology
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Lead Free* Construction

Description

The Watts Series 957 Reduced Pressure Zone Assembly Backflow Preventer, 2 1/2 inch, safeguards potable water systems from contamination caused by backpressure or backsiphonage. This compact unit features a durable 304 stainless steel housing and sleeve, along with domestic NRS resilient seated gate valves. An integrated flood sensor with SentryPlus Alert technology detects relief valve discharge, providing notification of potential flooding when paired with an add-on connection kit. Rated for 175 PSI maximum working pressure and temperatures from 33°F to 140°F, it ensures reliable performance for health hazard applications. Its lead-free construction meets national plumbing codes. Item number F792319.

Help Me Connect

Flood Sensor Connectivity

  • The integrated flood sensor with SentryPlus Alert technology is a passive component until activated by an add-on connection kit.
  • An add-on sensor connection kit (sold separately) enables the sensor to relay alerts for potential flooding events.
  • Connection kit options include compatibility with Building Management Systems (BMS), cellular communication, and the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

Physical Connections

  • This assembly is designed for horizontal installation and features grooved end connections, allowing for integral pipeline adjustment.
  • The NRS (Non-Rising Stem) gate valves provide reliable shutoff.
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Additional Details

This Watts Series 957 Reduced Pressure Zone Assembly Backflow Preventer provides essential protection for potable water systems, preventing contamination from backpressure or backsiphonage hazards.

It is designed for horizontal installation and features a compact, lightweight design with NRS (Non-Rising Stem) resilient seated gate valves.

Key Features

  • Equipped with a flood sensor featuring SentryPlus Alert technology to detect continuous discharge from the relief valve.
  • An add-on sensor connection kit (sold separately) activates advanced flood monitoring, allowing integration with Building Management Systems (BMS), cellular networks, or the Nexa platform via Wi-Fi.
  • Constructed with a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Features replaceable check disc rubber and patented torsion spring checks for lowest pressure loss.
  • Groove fittings enable integral pipeline adjustment and ensure unmatched ease of serviceability.
  • Includes a corrosion-resistant stainless steel bottom-mounted pressure relief valve and test cocks.
  • The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight, making it a Lead Free* product.

Specifications

General

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Series: 957
  • Size: 2 1/2 inch
  • Valve Type: NRS (Non-Rising Stem) Resilient Seated Gate Valves
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Orientation: Horizontal
  • Flood Detection: SentryPlus Alert Technology Flood Sensor

Performance

  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)

Materials

  • Housing & Sleeve: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna-N
  • Torsion Spring Checks: Noryl®, Stainless Steel
  • Check Discs: Reversible Silicone or EPDM
  • Test Cocks: Lead Free* Bronze Body
  • Pins & Fasteners: 300 Series Stainless Steel
  • Springs: Stainless Steel

Certificates & Approvals

  • Approved by FCCCHR-USC
  • AWWA: C511-97
  • ASSE: 1013
  • CSA: B64.4
  • NSF: Certified to NSF/ANSI 61-G

FAQs

What type of contamination does the Watts Series 957 protect against?

The Watts Series 957 Reduced Pressure Zone Assembly Backflow Preventer protects potable water systems from contamination caused by both backpressure and backsiphonage.

How does the flood sensor function on this backflow preventer?

The flood sensor features SentryPlus Alert technology and detects excessive water discharges from the relief valve. When an add-on connection kit is installed, the sensor relays signals to facility personnel for corrective action, helping to prevent flooding.

What materials are used in the construction of the Watts 957-DNRS-FS?

The housing and sleeve are made from 304 (Schedule 40) stainless steel. Elastomers include EPDM, silicone, and Buna-N. Test cocks are made from Lead Free* bronze body. The wetted surfaces contain less than 0.25% lead.

What are the operating pressure and temperature limits for this device?

This backflow preventer has a maximum working pressure of 175 PSI (12.1 bar) and an operating temperature range of 33°F to 140°F (0.5°C to 60°C).

What type of shutoff valves are included with this specific model?

This 957-DNRS-FS model includes domestic NRS (Non-Rising Stem) resilient seated gate valves, which are designed for reliable shutoff.

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