2 1/2 994-OSY-FS

Item Number: F437801
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$8,654.95
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 2 1/2 inch
  • Body Material: 300 Series Stainless Steel
  • Gate Valves: UL/FM Approved OSY
  • Maximum Working Pressure: 175 psi
  • Temperature Range: 33°F-110°F
  • Features SentryPlus Alert Flood Sensor
  • Lead Free: Yes (less than 0.25% lead)
  • Approved: ASSE 1013, CSA B64.5, UL, FM, FCCC&HRC

Description

This 2 1/2 inch lead-free Watts Series 994 Reduced Pressure Zone (RPZ) backflow preventer protects potable water from health hazard cross-connections. It features a durable 300 Series stainless steel body and UL/FM approved Outside Stem and Yoke (OSY) resilient seated gate valves. An integrated SentryPlus Alert flood sensor detects excessive water discharge, which can be activated with an add-on connection kit for remote notifications. Designed for easy maintenance with a compact, short lay length, it's approved by ASSE 1013, CSA B64.5, UL, and FM for reliable performance up to 175 psi. Item number F437801.

Help Me Connect

Flood Sensor Connectivity

  • The integrated flood sensor is passive without an add-on connection kit.
  • To activate flood monitoring and receive alerts, an add-on sensor connection kit is required.
  • Connection kit options include compatibility with BMS (Building Management Systems), cellular communication, or the Sensor Control Monitor which enables integration with BAS (Building Automation Systems) via RS-485 Modbus or the Nexa® platform through Wi-Fi.

General Connections

  • Flange dimensions are in accordance with AWWA Class D.
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Additional Details

This 2 1/2 inch lead free reduced pressure zone assembly backflow preventer protects potable water supplies from health hazard cross-connections by preventing backsiphonage and backpressure of hazardous materials.

Its compact modular design facilitates easy maintenance with a single access cover for in-line repairs and features a flood sensor with SentryPlus Alert technology to detect excessive water discharges from the relief valve.

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 is required to activate flood monitoring and enable integration with BMS, cellular communication, or the Nexa platform via Wi-Fi/RS-485 Modbus.
  • Constructed with a stainless steel body for long-term corrosion resistance and maximum strength.
  • Features UL and FM approved Outside Stem and Yoke (OSY) resilient seated gate valves.
  • Designed with a short lay length and compact construction for easier installation and smaller enclosures.
  • Bottom mounted relief valve reduces clearance requirements when installed against an outside wall.
  • No special tools required for servicing.

Watts is not responsible for the failure of alerts due to connectivity issues, power outages, or improper installation. Always ensure proper drainage in the event of a discharge.

Specifications

  • Size: 2 1/2 inch
  • Body Material: 300 Series Stainless Steel
  • Internal Metal Parts: 300 Series Stainless Steel
  • Check Assembly Material: Noryl®
  • Gate Valve Type: UL Classified and FM Approved OSY (Outside Stem & Yoke)
  • Lead Free: Yes (wetted surface contains less than 0.25% lead)
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F-110°F (0.5°C-43°C) continuous
  • Flood Sensor: Integrated with SentryPlus Alert technology
  • Lay Length (Dimension A): 37 inches (940 mm)
  • Weight with Gates: 148 lbs (67 kg)

Standards & Approvals

  • Approved by: ASSE 1013, CSA B64.5, UL Classified, FM Approved (OSY only, 2 1/2"-10" sizes), Foundation for Cross Connection Control & Hydraulic Research (2 1/2" to 6" sizes)
  • Standards Met: AWWA C511-92, CSA B64.5, UL Classified

FAQs

What is the primary purpose of this backflow preventer?

This Watts Series 994 Reduced Pressure Zone Assembly is designed to protect potable water supplies from contamination by preventing backsiphonage and backpressure of hazardous materials into the drinking water system.

Is this backflow preventer lead-free?

Yes, the wetted surface of this product that contacts consumable water contains less than one quarter of one percent (0.25%) of lead by weight, making it lead-free.

How does the flood sensor work and what connectivity options are available?

The integrated SentryPlus Alert flood sensor detects excessive water discharges from the relief valve. To activate alerts and enable communication, an add-on connection kit is required, which supports BMS, cellular communication, RS-485 Modbus, or Wi-Fi via the Nexa platform.

What materials are used in the construction of this assembly?

The main valve body and all internal metal parts are constructed from 300 Series stainless steel for corrosion resistance and strength, while the check assembly uses Noryl®.

What are the key certifications and approvals for this product?

This backflow preventer is approved by ASSE 1013, CSA B64.5, UL Classified, FM Approved (for OSY only, 2 1/2"–10" sizes), and the Foundation for Cross Connection Control & Hydraulic Research (for 2 1/2" to 6" sizes).

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