Zurn - 1" 375 Reduced Pressure Principle Backflow Preventer

The Zurn Wilkins 375 Reduced Pressure Principle Backflow Preventer delivers reliable high-hazard protection for non-potable water systems. Ideal for commercial and residential irrigation applications, its patented EZSwap™ Pressure Vessel allows for fast winterization, flushing, and repair. Engineered with reinforced nylon and stainless steel components for enhanced durability and theft deterrence.

Key Features:

• EZSwap™ removable pressure vessel for easy flushing and testing
• High-performance design for backsiphonage and backpressure protection
• Constructed with less bronze to deter theft
• Complies with ASSE® 1013, CSA® B64.4, AWWA C511, and USC approvals
• UL® and C-UL® classified (3/4" – 2", less shut-off valves)

Construction & Durability:

• Reinforced nylon housing (FDA approved)
• Stainless steel fasteners, springs, and struts (300 series)
• Elastomers: Silicone and Buna Nitrile (FDA approved)
• Delrin and nylon internals (NSF listed)
• Bronze ASTM B 584 ball valves

Performance & Functionality:

• Maximum working pressure: 175 PSI
• Maximum working temperature: 180°F
• Hydrostatic test pressure: 350 PSI
• End connections: Threaded FNPT (ANSI B1.20.1)

Ease of Installation & Use:

• Flush Fitting Tool replaces pressure vessel for quick servicing
• Ideal for outdoor or indoor installation (requires air gap adapter if indoors)
• Mounted 12”–30” above drain with side clearance for maintenance
• Compact, lightweight design simplifies transport and handling

Technical Specifications:

• Operating Pressure Range: Up to 175 PSI
• Maximum Temperature: 180°F
• Hydrostatic Test Pressure: 350 PSI
• Size: 1"
• Thread Type: FNPT (ANSI B1.20.1)
• Certifications: ASSE® 1013, IAPMO®, CSA® B64.4, AWWA C511, USC, UL®, C-UL®
• Pressure Vessel: Patented EZSwap™ design

Installation & Application:

• Recommended Uses: Irrigation systems (residential/commercial), fireline, industrial non-potable lines
• Installation Method: In-line on water supply, 12”–30” above drain, no submersion
• Soil & Climate Suitability: Suitable for varied climates—durable from freezing to hot conditions

Compatibility & Optional Accessories:

• Flush Fitting Tool (for servicing)
• Air gap adapter for indoor installations
• Compatible with standard FNPT pipe fittings