Description
Zurn Wilkins 34-975XL2 3/4" Lead-Free RPZ Reduced Pressure Backflow Preventer
Product Overview
The Zurn Wilkins 34-975XL2 3/4" Lead-Free RPZ Reduced Pressure Principle Assembly is designed to protect potable water systems against contamination caused by both backsiphonage and backpressure. Supplied with full-port QT ball valves and female NPT threaded connections, this high-hazard backflow preventer is suitable for potable-water installations where lead-free compliance is required.
The Model 975XL2 features a compact wye-pattern body that provides direct access to the first and second check assemblies without requiring removal of the relief valve or the complete device from the pipeline. This service-friendly design helps reduce maintenance time, labour requirements, and system downtime.
Low-lead cast-bronze construction, 300 Series stainless steel fasteners and springs, Noryl™ internal polymers, silicone and Buna-N elastomers, and stainless steel ball-valve handles provide durable performance in residential, commercial, institutional, municipal, and industrial potable-water applications.
Key Features & Benefits
- Protects potable water against backsiphonage and backpressure
- Designed for high-hazard cross-connection protection
- Lead-free construction for regulated potable-water applications
- Meets NSF/ANSI/CAN 61 requirements
- Includes an integrated differential relief valve
- Supplied with full-port QT ball valves
- 3/4" female NPT threaded inlet and outlet connections
- Compact wye-pattern body reduces overall lay length
- First and second check assemblies are serviceable in-line
- Checks can be maintained without removing the relief valve
- Complete assembly can remain installed during routine internal service
- Low-lead cast-bronze main body and access covers
- 300 Series stainless steel fasteners and springs
- Noryl™ internal polymer components
- Silicone and Buna-N elastomers
- Maximum working water pressure of 175 PSI
- Maximum working water temperature of 180°F
- Hydrostatic test pressure of 350 PSI
- ASSE® 1013 listed reduced pressure assembly
- Compatible air gap, strainer, repair kits, and testing accessories available separately
Why Choose the Zurn Wilkins 975XL2?
The Zurn Wilkins 975XL2 combines lead-free bronze construction with compact dimensions and convenient in-line service access. Its wye-pattern configuration allows technicians to reach both check assemblies without removing the relief valve or taking the complete backflow preventer out of the piping system.
The 34-975XL2 is well suited to 3/4" potable-water connections where reduced pressure principle protection is required. Its integrated relief valve, full-port ball valves, female NPT connections, 180°F temperature rating, and extensive approval profile make it a dependable choice for demanding installations.
Its 12" overall length and compact service layout also make the 34-975XL2 practical for mechanical rooms, utility areas, replacement projects, and installations where available space is limited.
Typical Applications
- Commercial plumbing systems
- Municipal potable-water services
- Irrigation and sprinkler systems
- Boiler and HVAC make-up water connections
- Mechanical equipment connections
- Industrial water systems
- Institutional facilities
- Healthcare and laboratory equipment
- Multi-unit residential buildings
- Water treatment equipment
- 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 Preventer shall meet the requirements of NSF/ANSI/CAN 61, shall be ASSE® Listed 1013, rated to 180°F, and supplied with full-port ball valves.
The main valve body and access covers shall be low-lead cast bronze conforming to ASTM B584. The seat rings and internal polymer components shall be Noryl™, and the seat-disc elastomers shall be silicone. Fasteners and springs shall be manufactured from 300 Series stainless steel.
The first and second check assemblies shall be accessible for maintenance without removing the relief valve or the complete device from the pipeline. Where installed indoors, the installation shall include an approved air-gap adapter. The Reduced Pressure Principle Backflow Preventer shall be a Zurn Wilkins Model 34-975XL2.
Product Specifications
| Specification | Details |
|---|---|
| Manufacturer | Zurn Wilkins |
| Model | 34-975XL2 |
| Series | 975XL2 |
| Assembly Type | Reduced Pressure Principle Assembly |
| Common Abbreviation | RP / RPZ |
| Nominal Size | 3/4" / DN20 |
| Shut-Off Valves | Full-Port QT Ball Valves |
| End Connections | Female NPT Threaded |
| Thread Standard | ANSI B1.20.1 |
| Maximum Working Pressure | 175 PSI / 12.1 bar |
| Maximum Working Temperature | 180°F / 82°C |
| Hydrostatic Test Pressure | 350 PSI / 24.1 bar |
| Main Body Material | Low-Lead Cast Bronze, ASTM B584 |
| Access Cover Material | Low-Lead Cast Bronze, ASTM B584 |
| Fasteners | 300 Series Stainless Steel |
| Springs | 300 Series Stainless Steel |
| Elastomers | Silicone and Buna-N |
| Internal Polymers | Noryl™ |
| Ball-Valve Handles | Stainless Steel |
| Relief-Valve Discharge-Port Area | 0.63 sq. in. / 406 mm² |
| Lead-Free | Yes — Maximum 0.25% Weighted-Average Lead Content |
| Installation Orientation | Horizontal |
| Order Number | 34-975XL2 |
Dimensions & Weight
| Dimension | Imperial | Metric |
|---|---|---|
| Overall Length with Ball Valves — A | 12" | 305 mm |
| Body Length — B | 7-3/4" | 197 mm |
| Dimension C | 2-1/8" | 54 mm |
| Dimension D | 3" | 76 mm |
| Dimension E | 3-1/2" | 89 mm |
| Dimension F | 5" | 127 mm |
| Overall Height — G | 16-1/8" | 410 mm |
| Approximate Weight | 12 lb | 5.5 kg |
| Order Number | 34-975XL2 | |
Dimensions and weights are approximate and do not include packaging.
Approximate Schedule 40 Pipe Capacity
| Pipe Velocity | Approximate Flow Capacity |
|---|---|
| 5 ft/sec | 8 GPM |
| 7.5 ft/sec | 12 GPM |
| 10 ft/sec | 17 GPM |
| 15 ft/sec | 25 GPM |
Published values represent approximate Schedule 40 pipe capacity and should not be interpreted as the certified rated flow of the backflow assembly.
Materials of Construction
| Component | Material |
|---|---|
| Main Valve Body | Low-Lead Cast Bronze, ASTM B584 |
| Access Covers | Low-Lead Cast Bronze, ASTM B584 |
| Fasteners | 300 Series Stainless Steel |
| Springs | 300 Series Stainless Steel |
| Elastomers | Silicone and Buna-N |
| Internal Polymers | Noryl™ |
| Ball-Valve Handles | Stainless Steel |
Standards & Approvals
- ASSE® Listed 1013
- IAPMO® Listed
- CSA® Certified B64.4
- AWWA C511 compliant
- Meets NSF/ANSI/CAN 61 requirements
- Maximum 0.25% weighted-average lead content
- UL® Classified when supplied less shut-off valves or with qualifying OS&Y valves
- cUL® Classified
- Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California
Approvals may vary by exact configuration, installation conditions, and jurisdiction. Verify project-specific requirements before ordering.
Installation Tips
- Install the assembly horizontally for proper relief-valve operation.
- Install the assembly in the direction of flow indicated on the valve body.
- Flush the supply piping thoroughly before installation.
- Follow all applicable plumbing and cross-connection-control requirements.
- Install according to the manufacturer's instructions and current applicable plumbing code.
- Install the assembly at least 12" (305 mm) above the surrounding flood level.
- Unless otherwise specified, mount the assembly no more than 30" (762 mm) above an adequately sized drain.
- Provide adequate clearance around the test cocks and access covers for testing and service.
- Provide an approved air gap at least twice the pipe diameter between the relief valve and drain piping.
- Do not pipe the relief valve directly or solidly to a floor drain, sewer, or sump.
- Do not install the assembly where any portion of the unit may become submerged.
- Protect outdoor installations from freezing and maintain the location above 32°F.
- Keep pits and vaults dry by providing adequate drainage.
- Slowly pressurize the assembly when placing it into service.
- Have the completed installation tested by qualified or licensed backflow personnel.
Compatible Options & Accessories
- Bronze Y-type strainer option
- Integral male 45° flare SAE test fittings
- Test-cocks-up configuration
- Street elbows for 3/4" and 1" models
- Union ball valves
- Zurn Model AG air gap
- Zurn repair kits
- Zurn Model XT thermal expansion tank
- Zurn Model 40XL2 soft-seated check valve
- Zurn Model 1260XL shock arrester
- QT-SET Quick Test Fitting Set
Options and accessories are sold separately unless expressly included in the product listing.
Frequently Asked Questions
What does the Zurn Wilkins 34-975XL2 protect against?
The 34-975XL2 protects potable-water systems from contamination caused by both backsiphonage and backpressure.
Does the 34-975XL2 include a relief valve?
Yes. It is a complete reduced pressure principle assembly with an integrated differential relief valve for high-hazard protection.
Is the 34-975XL2 lead-free?
Yes. It is manufactured from low-lead cast bronze, has no more than 0.25% weighted-average lead content, and meets NSF/ANSI/CAN 61 requirements.
Can the 34-975XL2 be used on potable-water systems?
Yes. The assembly is designed for installation on potable-water lines where lead-free valves and high-hazard backflow protection are required.
What shut-off valves are included?
The standard 34-975XL2 configuration includes full-port QT ball valves.
What type of pipe connections does it use?
The 34-975XL2 uses 3/4" female NPT threaded connections conforming to ANSI B1.20.1.
Can the check assemblies be serviced in-line?
Yes. The first and second check assemblies can be accessed without removing the relief valve or the complete assembly from the pipeline.
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 180°F, or approximately 82°C.
Must the 34-975XL2 be installed horizontally?
Yes. The manufacturer specifies horizontal installation to provide proper relief-valve operation.
Is an air gap required for indoor installation?
Yes. Indoor installations require suitable drainage and an approved air gap between the relief valve and drain piping.
How high should the assembly be installed?
Install the assembly at least 12" above the surrounding flood level and, unless otherwise specified, no more than 30" above the drain.
Does the 34-975XL2 require periodic testing?
Yes. The assembly should be tested after installation and inspected and maintained at least annually, or more frequently where required by local codes.
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