6 957N-NRS-FS

Item Number: F111611
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$16,182.21
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 6 inch
  • Weight: 427.0 lb
  • Maximum Working Pressure: 175 psi
  • Body Material: 304 Stainless Steel
  • Shutoff Valves: UL/FM Approved NRS Gate
  • Flood Sensor: SentryPlus Alert® technology
  • Installation: Horizontal N-Pattern
  • Certifications: ASSE 1013, CSA B64.4, UL, FM, NSF
  • Test Cocks: Lead Free* bronze body

Description

The 6 inch 957N-NRS-FS Reduced Pressure Zone Assembly Backflow Preventer safeguards potable water systems by preventing reverse flow from backpressure or backsiphonage. This unit features a durable 304 stainless steel body and UL/FM Approved NRS gate valves, ensuring reliable operation. Its compact design allows for installation in smaller spaces. A SentryPlus Alert® flood sensor provides early detection of continuous relief valve discharge, while groove couplings simplify installation. Certified to ASSE 1013, CSA B64.4, UL, FM, and NSF standards for horizontal N-pattern installation. Item number F111611.

Help Me Connect

Installation Orientation

  • This backflow preventer is designed for horizontal N-pattern installation only. Always ensure the flow arrow matches the direction of water flow in your piping system.

Connections

  • The assembly utilizes groove couplings for connection to existing piping, which simplifies installation and facilitates proper pipe alignment.

Flood Sensor Connectivity

  • To enable external communication and alerts from the integrated flood sensor, an add-on sensor connection kit (sold separately) is required. Without this kit, the sensor operates passively.
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Additional Details

This 6 inch Reduced Pressure Zone Assembly Backflow Preventer is designed to prevent the reverse flow of liquids into potable water systems due to backpressure or backsiphonage, mitigating potential health hazards.

Key Features

  • Features a flood sensor with SentryPlus Alert® technology to detect continuous discharge from the relief valve.
  • An add-on connection kit (sold separately) is required to activate the flood sensor for external communication to a Building Automation System (BAS) or the Nexa® platform via Wi-Fi. Without the kit, the sensor remains a passive component.
  • Constructed with a durable 304 (Schedule 40) stainless steel housing and sleeve.
  • Equipped with UL Classified and FM Approved outside stem and yoke (OS&Y) resilient seated gate valves.
  • Designed for horizontal N-pattern installation.
  • Utilizes a compact design, making it lighter and allowing for installation in smaller enclosures compared to traditional assemblies.
  • Includes replaceable check disc rubber and a bottom-mounted cast stainless steel relief valve.
  • Features groove couplings for ease of installation and proper pipe alignment.

Specifications

  • Product Type: Reduced Pressure Zone Assembly Backflow Preventer
  • Size: 6 inch
  • Pattern: N-Pattern (Horizontal Installation)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Operating Temperature Range: 33°F – 140°F (0.5°C – 60°C)

Materials

  • Housing & Sleeve: 304 (Schedule 40) stainless steel
  • Elastomers: EPDM, silicone, and Buna-N
  • Torsion Spring Checks: Norvic, stainless steel
  • Check Discs: Replaceable silicone or EPDM
  • Test Cocks: Lead Free* bronze body
  • Pins & Fasteners: 300 Series stainless steel
  • Springs: Stainless steel

Certificates & Approvals

  • ASSE: 1013
  • CSA: B64.4
  • UL: Classified cULus
  • FM: Approved
  • NSF: Approved
  • AWWA: C511-97
  • Approved by Foundation for Cross Connection Control and Hydraulic Research at The University of Southern California

FAQs

What is the primary function of this backflow preventer?

This backflow preventer is designed to protect potable water systems from contamination by preventing the reverse flow of non-potable liquids due to backpressure or backsiphonage conditions.

What size is this backflow preventer and how is it installed?

This unit is a 6 inch Reduced Pressure Zone Assembly. It is specifically designed and approved for horizontal N-pattern installations.

What materials are used in the construction of this backflow preventer?

The housing and sleeve are made from 304 (Schedule 40) stainless steel. Other components include EPDM, silicone, and Buna-N elastomers, Norvic torsion springs, and Lead Free* bronze test cocks.

Does this backflow preventer include a flood sensor?

Yes, it features a flood sensor with SentryPlus Alert® technology. An add-on connection kit is required to activate external communication for alerts.

What certifications and approvals does this product hold?

This backflow preventer is certified by ASSE 1013, CSA B64.4, UL (cULus), FM Approved, NSF, and AWWA C511-97. It is also approved by the Foundation for Cross Connection Control and Hydraulic Research at USC.

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