Zurn Wilkins 3510ST‑300A 6" #1 Check Assembly | 350AST Backflow Preventer Repair.
Product Overview
Maintain the performance of your Zurn Wilkins 350AST double check valve assembly with the genuine Zurn 3510ST‑300A #1 Check Assembly. Crafted for 6" units, this key component ensures your backflow preventer continues to protect potable water systems from back siphonage and back pressure. Designed for quick installation, its compound check design lets you service or replace without releasing spring tension, simplifying maintenance for professionals in plumbing and municipal services.
Features & Benefits
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OEM Replacement Part: Designed specifically for 6" 350AST double check backflow preventers
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Compound Check Design: Plastic cam check with self-contained springs—no need to release tension
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Time-Saving Maintenance: Spring tension remains intact during service
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Durable Construction: Built to Zurn’s rigorous standards for corrosion and pressure resistance
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Simplified Installation: Retaining clip secures assembly in place
Specifications
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Model: 3510ST‑300A
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Intended Use: #1 (first) check module for 6" Zurn Wilkins 350AST valve
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Material: NORYL™ cam check, stainless steel spring
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Design: Compound check unit, no spring decompression required
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Compatibility: Works with 350AST 6" models and repair manuals for 2½"–10" units
Installation Tips
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Follow Zurn’s 350AST installation and maintenance guide for safe check removal and replacement
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Drain the assembly and isolate pressure before servicing
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Remove retaining clip to extract check module
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Insert the check firmly, ensuring the clip retains it securely
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Reinstall top clamp and test per required backflow prevention checks
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For detailed steps, reference Zurn’s 350AST maintenance video
FAQs
Q: What makes the #1 check assembly unique?
A: It's the initial check controlling flow into the assembly. This compound design allows replacement without decompressing springs.
Q: Is this a genuine Zurn part?
Yes, it's an OEM replacement designed for Zurn Wilkins 6" 350AST backflow preventers.
Q: Can I install it without releasing pressure?
Yes. Its self-contained spring design lets you remove and replace the check module with pressure still in the system.
Q: Do I need tools or spring compression equipment?
No specialized tools are needed—just standard maintenance tools and following the Zurn guide.
Q: Where can I find detailed instructions?
Installation and maintenance guidelines are available for 2½"–6" units, and Zurn provides clear step-by-step repair videos
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