Zurn Wilkins 1/2" 375ST Stainless Steel Reduced Pressure Principle Backflow Preventer – Lead-Free
Product Overview
The Zurn Wilkins 1/2" 375ST Reduced Pressure Principle Assembly (RPZ) is a compact, lead-free backflow preventer designed for potable water systems where corrosion resistance and high-level protection are essential. Featuring stainless steel and reinforced nylon construction, the 375ST is built for environments where bronze valves are not suitable, such as food processing, distilleries, breweries, laboratories, and medical equipment systems.
The 1/2" 375ST provides reliable protection against both backsiphonage and backpressure, ensuring potable water supplies remain safe where health hazards exist. Compact and lightweight, it installs easily in confined spaces and offers long-term value with available repair kits for cost-effective maintenance.
Features & Benefits
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Corrosion-Resistant Design – Stainless steel and engineered plastics withstand harsh environments.
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Lead-Free Certified – Meets NSF/ANSI/CAN 61 and NSF/ANSI 372 for potable water safety.
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Compact & Lightweight – Easy to install in small spaces without sacrificing performance.
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Durable Construction – Reinforced nylon housing, stainless steel fasteners and springs, FDA-approved silicone elastomers.
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Cost-Effective Maintenance – Repair kits extend service life and lower long-term costs.
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Versatile Applications – Excellent for food service, medical facilities, breweries, and other systems requiring corrosion resistance.
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Certified & Approved – ASSE® 1013, CSA® B64.4, USC Foundation approval, IAPMO R&T certified.
Specifications
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Model: 1/2" 375ST
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Size: 1/2"
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Maximum Working Pressure: 175 PSI
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Hydrostatic Test Pressure: 350 PSI
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Maximum Temperature: 180°F (82°C)
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Housing: Reinforced Nylon (FDA approved)
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Elastomers: Silicone & Buna N (FDA approved)
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Internals: Delrin, Nylon
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Springs & Struts: Stainless Steel, 300 Series
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Ball Valves: Cast Stainless Steel ASTM A351, CF-8M
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End Connections: Threaded FNPT ANSI B1.20.1
Installation Tips
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Install between 12" (305mm) and 30" (762mm) above an adequate drain with side clearance for service access.
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Ensure the assembly cannot be submerged under any conditions.
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For indoor installations, add an air gap adapter to comply with plumbing code.
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Follow manufacturer instructions and Uniform Plumbing Code for setup.
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Align the valve with proper flow direction as indicated.
FAQs
Q: Where is the 1/2" 375ST typically used?
A: It’s ideal for smaller potable water systems in commercial kitchens, medical facilities, food production, and laboratories.
Q: Is the 1/2" 375ST certified as lead-free?
A: Yes, it complies with NSF/ANSI/CAN 61 and NSF/ANSI 372 lead-free requirements.
Q: Can this backflow preventer be serviced without replacing the unit?
A: Yes, repair kits are available for cost-effective maintenance and extended service life.
Q: Does this model protect against both backsiphonage and backpressure?
A: Yes, the 375ST provides full RPZ protection for high-hazard conditions.
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