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The Wilkins 1-950XL3U is a reduced pressure principle backflow prevention assembly designed to protect potable water supplies from contamination where a potential health hazard exists.

Key Specifications:

• Size: 1 Inches
• Maximum Working Pressure: 25/175 PSI
• Maximum Working Temperature: 180°F
• Notable Certifications: ASSE 1013, cUPC, CSA B64.4
• End Connections: FNPT threaded connections

Other Related Variants:

• 34-950XL3U: 3/4 Inches model size
• 2-950XL3U: 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 (305mm) and a maximum of 30 inches (762mm) 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 comprehensive protection against both backsiphonage and backpressure of contaminated water into potable water supply.
• Lead-Free Compliance: Certified to NSF/ANSI/CAN 372 with less than 0.25% weighted average lead content for safe drinking water applications.
• Easy Maintenance Access: First and second checks accessible for maintenance without removing relief valve or entire device from the line, with single access cover design.
• Union Ball Valves: The Zurn 1-950XL3U includes union ball valves for easy installation and removal without cutting pipes.

FAQ

Q: What is the minimum and maximum working pressure for the Zurn 1-950XL3U?

A: The minimum working water pressure is 25 PSI and the maximum is 175 PSI, with a hydrostatic test pressure of 350 PSI.

Q: At what height should this backflow preventer be installed?

A: The assembly must 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.

Q: What pressure reducing valves are recommended to pair with this assembly?

A: Suggested PRV pairings include Model 500XL3, Model 600XL3, and Model 625XL3 Pressure Reducing Valves for a complete system installation.

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