Zurn Wilkins 34-375ST 3/4" Stainless Steel RPZ Reduced Pressure Principle Backflow Preventer – Lead-Free.
Product Overview
The Zurn Wilkins 34-375ST 3/4" Reduced Pressure Principle Assembly (RPZ) is engineered to provide maximum backflow protection in potable water systems while offering superior resistance to corrosion. Featuring stainless steel construction with reinforced nylon components, this lead-free backflow preventer is ideal for demanding applications such as food processing, breweries, distilleries, laboratories, and medical facilities.
Compact, lightweight, and durable, the 34-375ST is designed to protect against both backsiphonage and backpressure, ensuring water safety where health hazards exist. Repair kits are available to extend service life, making it a cost-effective and reliable solution for long-term water protection.
Features & Benefits
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All-Stainless and Engineered Plastic Construction – Resists corrosion in harsh and high-moisture environments.
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Compact & Lightweight – Easy to handle and install in tight spaces.
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Lead-Free Certified – Meets NSF/ANSI/CAN 61 and NSF/ANSI 372 for potable water safety.
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Durable Components – Reinforced nylon housing, stainless steel fasteners and springs, FDA-approved elastomers.
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Cost-Saving Service – Repair kits reduce long-term maintenance expenses.
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Versatile Applications – Ideal for food service, medical systems, breweries, and industrial water lines.
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Certified & Approved – ASSE® 1013, CSA® B64.4, USC Foundation approval, and IAPMO R&T certified.
Specifications
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Model: 34-375ST
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Size: 3/4"
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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 12" (305mm) to 30" (762mm) above grade or drains with side clearance for maintenance.
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Ensure no part of the unit can be submerged.
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For indoor installations, use an air gap adapter for compliance.
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Follow all local plumbing codes and Uniform Plumbing Code requirements.
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Position with correct flow direction indicated by the valve body.
FAQs
Q: What applications is the 34-375ST best suited for?
A: It’s excellent for potable water systems in environments corrosive to bronze valves, such as food service, brewing, distilling, and healthcare facilities.
Q: Does this backflow preventer meet lead-free standards?
A: Yes, it meets NSF/ANSI/CAN 61 and NSF/ANSI 372 with less than 0.25% weighted average lead content.
Q: Can this be installed indoors?
A: Yes, with the addition of an air gap adapter to comply with plumbing codes.
Q: What size systems typically use this model?
A: The 3/4" size is commonly used in commercial and institutional potable water lines.
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