The Wilkins 34-975XL3S is a lead-free reduced pressure principle assembly designed for potable water protection against backsiphonage and backpressure contamination hazards.

Key Specifications:

• Size: 3/4 Inches
• Maximum Working Water Pressure: 175 PSI
• Maximum Working Water Temperature: 180°F
• Notable Certifications: ASSE 1013, cUPC, CSA B64.4
• End Connections: Threaded FNPT

Other Related Variants:

• 112-975XL3S: 1 1/2 Inches model size
• 114-975XL3S: 1 1/4 Inches model size
• 12-975XL3S: 1/2 Inches model size
• 1-975XL3S: 1 Inches model size
• 2-975XL3S: 2 Inches model size

Materials:

• Main valve body: Low Lead Cast Bronze ASTM B584
• Access covers: Low Lead Cast Bronze ASTM B584
• Fasteners: 300 Series Stainless Steel
• Elastomers: Silicone (FDA Approved)
• Elastomers: Buna Nitrile (FDA Approved)
• Polymers: Noryl™
• Springs: 300 Series Stainless Steel
• Ball valve handles: Stainless Steel

Typical Installation:

Local codes shall govern installation requirements. To be installed in accordance with the manufacturers' instructions and the latest edition of the Uniform Plumbing Code. Unless otherwise specified, the assembly shall be mounted at a minimum of 12 inches and a maximum of 30 inches above adequate drains with sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged.

Standards Compliance:

ASSE Listed 1013; cUPC Listed; CSA Certified B64.4; UL Classified; C-UL Classified; AWWA Compliant C511; Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California; Meets NSF/ANSI/CAN 61 and 372

Features & Benefits:

• Health Hazard Protection: Provides protection against both backsiphonage and backpressure of contaminated water into potable water supply where potential health hazards exist.
• Lead-Free Compliance: Certified to NSF/ANSI/CAN 372 with less than 0.25% weighted average lead content, ideal for use where lead-free valves are required.
• Easy Maintenance Access: First and second checks are accessible for maintenance without removing relief valve or entire device from the line, with shared single access cover.
• Complete System Package: Supplied standard with full port QT ball valves and integral test fittings, includes optional lead-free wye type strainer (Model SXL).

FAQ

Q: What is the minimum working pressure required for the Zurn 34-975XL3S?

A: The Zurn 34-975XL3S requires a minimum working water pressure of 25 PSI to function properly.

Q: Can this backflow preventer be installed below ground or in a submerged location?

A: No, the installation must be made so that no part of the unit can be submerged. It must be mounted 12 to 30 inches above adequate drains.

Q: What pressure reducing valves are suggested to pair with the 34-975XL3S?

A: Wilkins recommends pairing with Model 500XL3, 600XL3, or 625XL3 Pressure Reducing Valves for a complete system installation.

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