The Wilkins 1-975XLUS is a 1 Inch reduced pressure principle backflow preventer designed for high hazard protection in potable water service lines, featuring union ball valves and bronze Y-type strainer for enhanced serviceability.

Key Specifications:

• Size: 1 Inches
• Maximum Working Water Pressure: 175 PSI
• Maximum Working Water Temperature: 180°F
• Notable Certifications: ASSE 1013, CSA B64.4, AWWA C511
• End Connections: FNPT with union ball valves

Other Related Variants:

• 34-975XLUS: 3/4 Inches model size

Materials:

• Cast Bronze ASTM B584 (Main valve body and access covers)
• Stainless Steel 300 Series (Fasteners and springs)
• Silicone (Elastomers)
• Buna Nitrile (Elastomers)
• Noryl™ (Polymers)

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; UL Classified; C-UL Classified; CSA Certified B64.4; AWWA compliant C511; Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California; NYC MEA 425-89-M VOL 3; NSF/ANSI/CAN 61 & 372 (lead-free)

Features & Benefits:

• High Hazard Protection: Provides reliable protection against both backsiphonage and backpressure of contaminated water into the potable water supply where potential health hazards exist.
• Easy Maintenance Access: Union ball valves allow for easy removal of the assembly body for service, testing, and winterization without disrupting the entire piping system.
• Debris Protection: Bronze Y-type strainer protects internal components from particulates and extends the service life of the assembly.
• Durable Construction: Cast bronze body with stainless steel fasteners and springs ensures long-lasting performance and corrosion resistance in demanding water service applications.

FAQ

Q: What is the difference between the Zurn 1-975XLUS and the standard 1-975XL model?

A: The Zurn 1-975XLUS includes union ball valves (U suffix) and a bronze Y-type strainer (S suffix), allowing for easy removal for service and providing debris protection, while the standard model comes with full port QT ball valves without the strainer.

Q: At what height should the assembly 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, ensuring no part of the unit can be submerged.

Q: Can this backflow preventer be used for potable water applications?

A: This assembly is designed for non-potable applications only as specified in the manufacturer documentation, despite its compliance with potable water standards and certifications.

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