2 1/2 957RPDA-DOSY-GPM

Item Number: 0113056
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$7,842.32
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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
  • Weight: 225.0 lb
  • Body Material: 304 (Schedule 40) Stainless Steel
  • Maximum Working Pressure: 175 PSI
  • Temperature Range: 33°F - 140°F
  • Features Gallons per Minute (GPM) meter
  • UL Classified and FM Approved
  • Equipped with domestic OSY shutoff valves
  • Flood sensor on relief valve for discharge detection

Description

The Watts 2 1/2 inch 957RPDA-OSY Reduced Pressure Detector Assembly Backflow Preventer offers robust protection against back-siphonage and backpressure in fire protection systems. Constructed with a durable 304 stainless steel housing and sleeve, it includes domestic Outside Stem and Yoke (OSY) shutoff valves and a corrosion-resistant relief valve. This compact assembly features patented torsion spring checks, a gallons per minute meter for leak detection, and an integrated flood sensor. It is UL Classified, FM Approved, ASSE 1047, AWWA C511-97, and CSA B64.4 certified, ensuring reliable performance for health hazard cross-connections. Item number 0113056.

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Installation & Compatibility

  • This 2 1/2 inch Reduced Pressure Detector Assembly is approved for horizontal N pattern installation.
  • Features groove couplings for ease of installation and integral pipe alignment.
  • The integrated flood sensor requires an add-on connection kit for activation and communication with building management systems (BMS) or cellular networks.
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Additional Details

The 2 1/2 inch Watts Series 957RPDA Reduced Pressure Detector Assembly Backflow Preventer provides critical protection for potable water systems from contamination due to back-siphonage or backpressure, meeting national plumbing codes and water authority requirements. This compact and lightweight assembly is designed for health hazard cross-connections, particularly on fire sprinkler systems and service line entrances.

A WARNING: It is illegal to use this product in any plumbing system providing water for human consumption, such as drinking or dishwashing, in the United States. Before installing, consult your local water authority, building, and plumbing codes.

Construction & Design

  • Features a 304 (Schedule 40) stainless steel housing and sleeve for durability.
  • Groove fittings ensure easy installation and integral pipeline adjustment.
  • Equipped with patented torsion spring check modules for lowest pressure loss and unmatched serviceability.
  • Includes domestic outside stem and yoke (OSY) resilient seated gate valves and a corrosion-resistant bottom-mounted cast stainless steel relief valve.
  • A gallons per minute meter in the bypass line helps detect underground leaks or unauthorized water use.
  • Integrated flood sensor on the relief valve detects excessive water discharges.

Specifications

  • Size: 2 1/2 inch
  • Model: 957RPDA-OSY
  • Body Material: 304 (Schedule 40) Stainless Steel
  • Housing & Sleeve Material: 304 (Schedule 40) Stainless Steel
  • Elastomers: EPDM, Silicone, Buna 'N'
  • Torsion Spring Checks Material: Noryl®, Stainless Steel
  • Check Discs Material: Reversible Silicone or EPDM
  • Test Cocks Material: Lead Free* Bronze Body
  • Pins & Fasteners Material: 300 Series Stainless Steel
  • Springs Material: Stainless Steel
  • Maximum Working Pressure: 175 PSI (12.1 bar)
  • Temperature Range: 33°F - 140°F (0.5°C - 60°C)
  • Weight: 142 lb (64 kg)

Certificates & Approvals

  • Approved by: Foundation for Cross-Connection Control and Hydraulic Research at USC (FCCCHR-USC)
  • Standard: AWWA C511-97
  • Listing: ASSE 1047
  • Certification: CSA B64.4
  • Classification: UL Classified (BFG & OSY Only)
  • Approval: FM Approved (BFG & OSY Only)

FAQs

What is the primary use of this Watts 957RPDA backflow preventer?

This backflow preventer is primarily designed to protect potable water systems from contamination due to back-siphonage and backpressure, specifically in health hazard applications like fire sprinkler systems.

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

The housing and sleeve are made from 304 (Schedule 40) stainless steel. Elastomers are EPDM, silicone, and Buna 'N', while check discs are reversible silicone or EPDM.

Does this assembly include a flood sensor?

Yes, this model includes a flood sensor on the relief valve to detect excessive water discharges. An add-on connection kit is required to activate its flood alert feature.

What is the maximum operating pressure and temperature range?

The maximum working pressure for this 2 1/2 inch unit is 175 PSI (12.1 bar), and it operates within a temperature range of 33°F to 140°F (0.5°C to 60°C).

Is this backflow preventer approved by regulatory bodies?

Yes, it is UL Classified, FM Approved, ASSE 1047 listed, AWWA C511-97 compliant, and CSA B64.4 certified, ensuring it meets industry standards.

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