4 994-OSY-FS

Item Number: F438049
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$11,127.69
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When Will it Ship: Contact for Lead Time
Estimated transit time: 2 to 5 Business Days

Brand - Watts
  • Size: 4 inch
  • Weight: 350.0 lb
  • Lead Free: Wetted surface contains <0.25% lead
  • Body Material: 300 Series Stainless Steel
  • Valve Type: OSY Resilient Seated Gate Valves
  • Integrated Flood Sensor with SentryPlus Alert®
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F to 110°F
  • Approvals: UL Classified, FM Approved, ASSE 1013

Description

The Watts Series 994 4 inch Lead Free Reduced Pressure Zone (RPZ) Assembly is a backflow preventer designed to protect potable water supplies from health hazard cross-connections. It features a durable 300 Series stainless steel body, UL and FM Approved outside stem and yoke (OSY) shutoff valves, and a compact, short lay length for easy installation. An integrated flood sensor with SentryPlus Alert® technology detects excessive relief valve discharge, providing early warning when paired with an add-on connection kit. Rated for 175 PSI and temperatures from 33°F to 110°F, this assembly meets ASSE 1013 standards. Item number F438049.

Help Me Connect

Flood Sensor Connection

  • The integrated flood sensor is a passive component until an add-on connection kit (sold separately) is installed.
  • Connection kit options include BMS, cellular communication, or the Sensor Control Monitor for integration with BAS via RS-485 Modbus or the Nexa® platform through Wi-Fi.

General Connections

  • This assembly is typically installed on the main potable water supply line to protect against health hazard cross-connections.
  • Features grooved coupling connections for the main body and flanged inlet/outlet gate connections for the OSY shutoff valves.
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Additional Details

This Watts Series 994 4 inch Lead Free Reduced Pressure Zone (RPZ) Assembly backflow preventer is designed to protect potable water supplies from contamination caused by backpressure or backsiphonage from health hazard cross-connections.

The assembly features a compact, short lay length stainless steel body with OSY shutoff valves and an integrated flood sensor for enhanced safety.

Features

  • Lead Free construction: wetted surface contains less than 0.25% lead by weight.
  • Flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve.
  • Requires an add-on connection kit (sold separately) to activate flood monitoring and relay alerts to facility personnel or building management systems (BMS).
  • Stainless steel body and internal parts provide long-term corrosion resistance and maximum strength.
  • Torsion spring check valves ensure maximum flow at low pressure drop.
  • Outside Stem and Yoke (OSY) resilient seated gate valves are UL Classified and FM Approved.
  • Bottom-mounted relief valve reduces clearance requirements for outside wall installations.
  • Compact modular design with a single access cover for easy in-line maintenance and repair without special tools.

Components

  • Main valve body: 300 Series stainless steel.
  • All internal metal parts: 300 Series stainless steel.
  • Check assembly: Noryl®.
  • Resilient seated shutoff valves and four ball-type test cocks.

Specifications

  • Product Type: Reduced Pressure Zone (RPZ) Assembly
  • Model Series: Watts 994-OSY-FS
  • Nominal Size: 4 inch
  • Body Material: 300 Series Stainless Steel
  • Internal Metal Parts: 300 Series Stainless Steel
  • Check Assembly Material: Noryl®
  • Valve Type: Outside Stem and Yoke (OSY) Gate Valves
  • Lead Content: Wetted surface contains less than 0.25% lead by weight
  • Maximum Working Pressure: 175 psi (12.1 bar)
  • Temperature Range: 33°F-110°F (0.5°C - 43°C) continuous
  • Lay Length (A): 40 inches (1016 mm)
  • Height (D, open): 10.5 inches (267 mm)
  • Weight (with gates): 235 lbs (107 kg)

Standards & Approvals

  • AWWA Standard: C511-92
  • CSA Standard: B64.5
  • ASSE Standard: 1013
  • Certifications: UL Classified, FM Approved
  • Other Approvals: Foundation for Cross Connection Control & Hydraulic Research (University of Southern California)

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 caused by backpressure or backsiphonage, specifically where health hazards may exist.

Is this product "Lead Free"?

Yes, the product is certified as "Lead Free." The wetted surface of this product, which contacts consumable water, contains less than one-quarter of one percent (0.25%) of lead by weight.

How does the flood sensor work?

The integrated flood sensor with SentryPlus Alert® technology detects excessive water discharges from the relief valve. To activate flood monitoring and receive alerts, an add-on connection kit (sold separately) must be installed.

What are the key materials used in this assembly?

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

What are the maximum operating pressure and temperature limits?

This 4 inch RPZ assembly has a maximum working pressure of 175 psi (12.1 bar) and operates continuously in a temperature range of 33°F to 110°F (0.5°C to 43°C).

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