Description
Zurn Wilkins 2-1/2″ 350AST Double Check Valve Assembly | Stainless Steel Backflow Preventer with NRS Gate Valves
Product Overview
The Zurn Wilkins 212-350AST is a 2-1/2″ Double Check Valve Assembly (DCVA) designed to deliver dependable backflow prevention in potable water systems where a non-health hazard exists. Featuring a corrosion-resistant 304L stainless steel body and non-rising stem (NRS) gate valves, this backflow preventer offers a compact, space-saving solution for installations where performance, durability, and compliance are critical. Its short lay length and lead-free certification make it ideal for retrofits and tight-space applications in commercial, industrial, and municipal settings.
Features & Benefits
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Reliable Backflow Prevention: Stops back pressure and back siphonage from contaminating potable water lines
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Compact Design: Short body length fits into tight mechanical rooms or retrofit sites
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Stainless Steel Body: Resists corrosion and extends system life
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Non-Rising Stem Gate Valves: Full-port valves ensure control without requiring vertical clearance
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In-Line Serviceability: Internal check components accessible without removing the assembly
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Lead-Free Certified: Complies with NSF/ANSI 372 for safe use in potable water systems
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Flexible Install Options: Approved for both horizontal and vertical orientations
Specifications
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Valve Size: 2-1/2″
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Main Body & Cover: 304L Stainless Steel
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Internal Materials: NORYL™, 300 Series Stainless Steel, EPDM Seals, Buna-N O-Rings
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Maximum Working Pressure: 175 PSI
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Hydrostatic Test Pressure: 350 PSI
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Max Operating Temperature: 140°F
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End Connections:
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Grooved (AWWA C606)
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Flanged (ANSI B16.1 Class 125)
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Certifications & Compliance:
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ASSE® Listed 1015
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AWWA C510 & C550 Compliant
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NSF/ANSI 61 & 372 Certified
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FM®, UL®, C-UL®, CSA®, IAPMO® Listed
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USC Foundation Approved
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Installation Tips
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Install 12″ to 30″ above grade with sufficient clearance for drainage and testing
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Ensure no part of the unit is submerged; follow local plumbing code requirements
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Unit may be installed horizontally or vertically where code permits
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Allow side access for maintenance and testing tools
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For retrofits, the 350AST can replace older 300ASTR models with minimal pipe adjustment
FAQs
Q: What is this DCVA designed to protect against?
A: It prevents back siphonage and back pressure, stopping non-health hazard contaminants from entering potable water systems.
Q: Is the unit certified for drinking water use?
A: Yes, it meets NSF/ANSI 61 and 372 standards for lead-free performance in potable water systems.
Q: Can the check valves be maintained in place?
A: Yes, all internal components are designed for in-line service—no need to remove the assembly.
Q: What’s the difference between NRS and OS&Y valves?
A: Non-rising stem (NRS) valves save space by keeping the stem within the valve body, ideal for below-grade or tight installs.
Q: Is this product suitable for retrofit projects?
A: Yes, it’s compact and compatible with the 300ASTR series, making it a great fit for system upgrades.
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