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The Wilkins 1-420XL is a pressure vacuum breaker assembly designed to protect potable water systems against backsiphonage with an integral anti-freeze relief valve.

Key Specifications:

• Available Sizes: 3/4 Inches, 1 Inches
• Maximum Working Pressure: 175 PSI
• Maximum Working Temperature: 140°F
• Notable Certifications: ASSE 1020, CSA B64.1.2
• Thread Connections: ANSI B1.20.1

Other Related Variants:

• 34-420XL: 3/4 Inches model size

Materials:

• Cast Bronze ASTM B 584 main valve body
• Silicone elastomers (FDA Approved)
• Buna Nitrile elastomers
• Polypropylene polymers (FDA Approved)
• POM Acetal (Delrin) polymers
• PPE (Noryl) polymers
• Stainless Steel springs, 300 Series

Typical Installation:

Local codes shall govern installation requirements. Unless otherwise specified, the assembly shall be installed in accordance with the manufacturers' instructions and the latest edition of the Uniform Plumbing Code. The assembly shall be mounted at a minimum of 12 inches (305mm) above the highest piping or outlet downstream of the device. Install with adequate drain and sufficient side clearance for testing and maintenance. The installation shall be made so that no part of the unit can be submerged. A pressure vacuum breaker cannot be installed where back-pressure could occur or where spillage of water from vent could cause damage.

Standards Compliance:

ASSE Listed 1020; UPC Listed; CSA Certified B64.1.2; Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California; NSF/ANSI/CAN 372

Features & Benefits:

• Backsiphonage Protection: The Zurn 1-420XL protects potable water supply against contamination from backsiphonage in continuous pressure applications.
• Anti-Freeze Protection: Integral anti-freeze relief valve reduces the risk of valve damage under intermittent, non-seasonal freezing conditions for indoor or outdoor installation.
• Easy Maintenance: Replaceable thermoplastic modular cartridge design allows for convenient maintenance and testing without removing the device from the line.
• Lead-Free Compliance: Low lead cast bronze construction meets NSF/ANSI/CAN 372 requirements with less than 0.25% weighted average lead content for safe potable water applications.

FAQ

Q: What is the minimum installation height requirement for the Zurn 1-420XL?

A: The assembly must be mounted at a minimum of 12 inches (305mm) above the highest piping or outlet downstream of the device to ensure proper operation and protection.

Q: Can the Wilkins 1-420XL be installed where back-pressure could occur?

A: No, a pressure vacuum breaker cannot be installed where back-pressure could occur or where spillage of water from the vent could cause damage. It is designed for backsiphonage protection only.

Q: Is the 1-420XL suitable for outdoor installation in freezing climates?

A: Yes, the integral anti-freeze relief valve reduces the risk of valve damage under intermittent, non-seasonal freezing conditions. However, proper winterization procedures should be followed in cold climates as recommended in the installation guidelines.

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