Zurn Wilkins 212-375A 2.5" RPZ Reduced Pressure Backflow Preventer with NRS Gate Valves

Zurn Wilkins 212-375A 2-1/2" Reduced Pressure Backflow Preventer with NRS Gate Valves

Product Overview

The Zurn Wilkins 212-375A 2-1/2" Reduced Pressure Principle Assembly is a lead-free commercial backflow preventer designed to protect potable water systems against both backsiphonage and backpressure. Supplied with full-port non-rising stem gate valves and flanged end connections, this RP assembly provides dependable protection for high-hazard commercial, industrial, institutional, and mechanical plumbing applications.

The Model 375A uses Zurn Wilkins' low-headloss compound check design to support efficient hydraulic performance while simplifying inspection and service. The check assemblies and relief valve are accessible from the top of the unit, allowing maintenance without removing the backflow preventer from the pipeline.

An epoxy-coated ductile iron body, stainless steel internal components, NORYL™ check components, EPDM seal rings, and a stainless steel braided sensing line provide durable performance in demanding potable-water installations.

Key Features & Benefits

• Protects potable water against backsiphonage and backpressure
• Designed for high-hazard cross-connection applications
• Includes full-port non-rising stem gate valves
• Flanged inlet and outlet connections for commercial piping systems
• Low-headloss compound check design supports efficient water flow
• Top-access check assemblies and relief valve simplify maintenance
• Internal components can be serviced without removing the assembly from the line
• Epoxy-coated ductile iron body provides strength and corrosion resistance
• 300 Series stainless steel internal components, fasteners, and springs
• NORYL™ seat rings and check valve components
• EPDM seal rings for potable-water service
• Stainless steel braided relief-valve sensing line
• Lead-free construction for regulated potable-water installations
• Maximum working water pressure of 175 PSI
• Repair kits and compatible accessories support long-term serviceability

Why Choose the Zurn Wilkins 375A?

The Zurn Wilkins 375A combines commercial-grade ductile iron construction with a service-friendly design intended to reduce inspection and maintenance time. Its check assemblies and relief valve are accessible through the top covers, helping technicians perform routine testing, cleaning, and internal repairs without removing the complete valve body from the piping system.

The 375A is designed for installations where a potential health hazard exists and reduced pressure principle protection is required. Its low-headloss compound check design helps maintain system performance while providing protection against both backsiphonage and backpressure.

The 2-1/2" and 3" versions use the proven 4" Model 375A body with reducer couplings. This configuration provides compatibility with smaller system piping while retaining the hydraulic characteristics and serviceability of the larger assembly platform.

Typical Applications

• Commercial buildings
• Industrial facilities
• Schools and universities
• Hospitals and healthcare facilities
• Multi-unit residential buildings
• Municipal and institutional facilities
• Manufacturing and processing plants
• Irrigation systems
• Mechanical equipment connections
• Boiler and HVAC make-up water systems
• Fire protection system connections where permitted
• Other high-hazard potable-water cross-connections

Final product selection and installation must comply with applicable plumbing codes, cross-connection-control requirements, and the authority having jurisdiction.

Engineering Specification

The Reduced Pressure Principle Backflow Prevention Assembly shall meet the requirements of NSF/ANSI/CAN 61 and shall be ASSE® Listed 1013. The assembly shall be supplied with full-port non-rising stem gate valves.

The main valve body and access covers shall be epoxy-coated ductile iron conforming to ASTM A536. The seat rings and check valve components shall be constructed from NORYL™. Internal components, fasteners, and springs shall be manufactured from 300 Series stainless steel. Seal rings shall be EPDM, and O-rings shall be Buna-N.

The check assemblies and relief valve shall be accessible for inspection and maintenance without removing the assembly from the pipeline. The Reduced Pressure Principle Backflow Prevention Assembly shall be a Zurn Wilkins Model 212-375A.

Product Specifications

Dimensions & Weight

The 2-1/2" Model 375A uses a 4" valve body with reducer couplings. Dimensions and weights are approximate and do not include packaging.

Materials of Construction

Standards & Approvals

• ASSE® Listed 1013
• AWWA C511 compliant with gate valves
• AWWA C550 compliant
• IAPMO® Listed
• CSA® Certified
• UL® Classified
• cUL® Classified
• FM® Approved
• Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
• NYC MEA 484-04-M
• Meets the requirements of NSF/ANSI/CAN 61
• Lead-free construction with no more than 0.25% weighted-average lead content

Approvals may vary by assembly size, valve configuration, installation orientation, and jurisdiction. Verify project-specific requirements before ordering.

Installation Tips

• Install the assembly in the direction of flow indicated on the valve body.
• Follow all applicable plumbing, backflow-prevention, and cross-connection-control regulations.
• Unless otherwise specified, mount the assembly at least 12" (305 mm) and no more than 30" (762 mm) above an adequately sized drain.
• Provide sufficient side and top clearance for testing, inspection, and internal maintenance.
• Position the relief valve above a drain capable of handling discharge during normal operation or a backflow event.
• Do not install the assembly where any portion of the unit may become submerged.
• Provide freeze protection and a suitable protective enclosure for outdoor installations in cold climates.
• Support adjoining piping independently to prevent excessive pipe weight or mechanical stress from being transferred to the assembly.
• Flush the supply piping before installation to prevent construction debris from damaging the check assemblies or relief valve.
• Install an approved air gap where required for relief-valve drainage.
• Allow unrestricted access to the shut-off valves, test cocks, access covers, and relief-valve sensing line.
• Have the completed installation tested by a qualified or certified backflow tester as required by the local authority.

Compatible Accessories

• Zurn AG air gap
• QT-SET Quick Test Fitting Set
• Rubber repair kit
• Zurn XT thermal expansion tank
• ZCSM-PF Connected Pressure Monitor
• ZCSM-BTM Connected Flow Meter
• Additional testing, service, and monitoring components specified for the Model 375A series

Accessories are sold separately unless expressly included in the product listing.

Frequently Asked Questions

What does the Zurn Wilkins 212-375A protect against?
The 212-375A protects potable-water systems against both backsiphonage and backpressure. As a reduced pressure principle assembly, it is intended for applications where a cross-connection may present a potential health hazard.

What shut-off valves are included?
This configuration includes full-port non-rising stem gate valves. The exterior pipe connections are flanged for installation in commercial and industrial piping systems.

Is the Zurn Wilkins 212-375A lead-free?
Yes. The assembly is designed for regulated potable-water applications and meets the applicable lead-free requirement of no more than 0.25% weighted-average lead content.

Can the 375A be serviced without removing it from the pipeline?
Yes. The check assemblies and relief valve are accessible through the top access covers, allowing routine inspection and internal service without removing the complete valve body from the pipeline.

Can the Zurn Wilkins 375A be installed vertically?
Permitted installation orientation can depend on the exact assembly configuration, approval listing, and local requirements. Confirm the proposed orientation with the authority having jurisdiction before installation.

What is the maximum working pressure?
The maximum working water pressure is 175 PSI, or approximately 12.1 bar.

What is the maximum working temperature?
The maximum working water temperature is 140°F, or 60°C.

Why does the 2-1/2" assembly use reducer couplings?
The 2-1/2" and 3" versions use the 4" Model 375A body with reducer couplings. This provides the required smaller pipe connection while retaining the hydraulic and maintenance features of the larger body platform.

How high should the assembly be installed above the drain?
Unless local requirements specify otherwise, the assembly should be installed at least 12" and no more than 30" above an adequately sized drain.

Does this backflow preventer require periodic testing?
Yes. Reduced pressure principle assemblies generally require commissioning and recurring field testing by a qualified backflow tester. Testing frequency is determined by local regulations and the authority having jurisdiction.