Zurn Wilkins 2-1/2" 375AST Reduced Pressure Backflow Preventer | Stainless Steel RPZ Assembly.
Product Overview
The Zurn Wilkins 212‑375AST is a 2‑1/2" Reduced Pressure Principle (RP) backflow preventer, built to shield potable water systems from contamination due to backsiphonage and backpressure. With a durable 304L stainless steel body, non‑rising stem gate valves, and certified lead‑free construction, this RP assembly ensures compliance and reliability in commercial, industrial, and municipal applications. Its compact design and in‑line serviceability streamline installation and maintenance.
Features & Benefits
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Premium Backflow Protection: Dual-check design combined with a relief valve ensures robust backflow prevention.
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Space-Saving Layout: Short lay-length makes it perfect for tight mechanical spaces.
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Stainless Steel Durability: Resists corrosion for long-term performance.
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Lead-Free Certified: Meets NSF/ANSI 372 standards.
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Non-Rising Stem Gate Valves: Full-port valves provide flush flow without extra clearance.
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In-Line Servicing: Check modules and relief valve accessible without line removal.
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Retrofit Capable: Compatible with older 300ASTR models for easy upgrades.
Specifications
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Size: 2‑1/2"
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Body & Cover: 304L Stainless Steel
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Internal Materials: NORYL™ check modules, stainless steel springs, EPDM seals, Buna-N O-rings
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Max Working Pressure: 175 PSI
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Test Pressure: 350 PSI
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Operating Temp: up to 140 °F
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Connections: Grooved (AWWA C606) or Flanged (ANSI B16.1 Class 125)
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Certifications: ASSE 1013, AWWA C511 & C550, FM, UL, CSA, IAPMO, NSF 61 & 372
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Orientations Approved: Horizontal and Vertical
Installation Tips
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Mount 12–30″ above grade with access to drainage.
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Allow clearance for side access to test ports and internal checks.
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Do not submerge; install above flood level.
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Supports both horizontal and vertical installation — follow local code.
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Use the factory-maintenance and installation manual for step-by-step guidance.
FAQs
Q: What makes this an RP backflow preventer?
A: The automated relief valve between two checks ensures system relief when pressures rise against flow, preventing contaminated water from entering potable supply.
Q: Is it lead-free and suitable for drinking water?
A: Yes. It’s certified to NSF/ANSI 372 and 61 for lead-free use in potable water systems.
Q: Can I service it without removing from the line?
A: Yes, check assemblies and the relief valve are accessible in-line for maintenance and testing.
Q: Are these valves space-efficient?
A: Absolutely — non-rising stem gate valves don't extend vertically, saving installation space.
Q: Can I use this to replace older RP designs?
A: Yes. It retrofits older 300ASTR models without major pipe modifications.
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