Zurn Wilkins 34-350 3/4" Double Check Backflow Preventer with EZSwap Vessel - 34-350
The Wilkins 34-350 3/4" Double Check Backflow Preventer provides reliable protection against backpressure and backsiphonage in potable and non-potable systems. Built for quick service and long-term outdoor use, it combines a bronze pressure body (3/4") with the patented EZSwap removable pressure vessel to simplify flushing, repair, and winterization.
Specs & documentation: Nominal size 3/4", full-port connections, typical length ~11" and height ~5.6". Includes installation and maintenance instructions, repair parts lists, and specification sheets for installers and contractors. Backed by a 1-year limited warranty; consult provided documents for ordering parts and approved installations.
Engineered for contractors and facility managers, the 34-350 minimizes service trips and replacement costs with serviceable internals and proven materials. For installation guidance, testing procedures, and parts diagrams, see the linked specification and repair manuals supplied with the product.
Features
- EZSwap removable pressure vessel allows off-line servicing and fast replacement with the Flush Tool, reducing repair time and downtime.
- Full-port quarter-turn ball shut-off valves provide positive isolation for maintenance; stainless-steel handles and hardware resist corrosion.
- Top-mounted fast test cocks enable straightforward annual testing and field maintenance without removing the unit from the line.
- Lead-free/low-lead construction suitable for potable water; bronze body for 3/4" sizes and reinforced nylon vessel deliver durability and corrosion resistance.
- Certified to ASSE 1015, AWWA C510, CSA B64.5, cUPC and NSF/ANSI 61; rated to 175 psi and 180°F for broad application use.
- Compatible with optional blow-out/winterizing accessories and designed to reduce labor and water usage during line flushing.
What our Experts Think
Q&A
Q: What is the Zurn Wilkins 34-350 3/4" Double Check Backflow Preventer with EZSwap Vessel used for?
A: It prevents backflow contamination in low-hazard potable water systems like irrigation, hose bibs, and small commercial water lines.
Q: What type of device is the 34-350?
A: It is a Double Check Backflow Preventer (DCVA) designed to stop back-siphonage and backpressure in non-health-hazard applications.
Q: What is the EZSwap vessel system?
A: EZSwap allows quick internal check assembly replacement, reducing downtime and simplifying maintenance without removing the full unit.
Q: What are key features of the 3/4" 34-350?
A: Compact design, lead-free construction, dual check valves, isolation ball valves, and service-friendly modular components.
Q: Where is it commonly used?
A: Residential irrigation systems, small commercial plumbing lines, and other low-risk potable water protection setups.
Q: Does it require testing or maintenance?
A: Yes, periodic backflow testing and inspection are required to ensure compliance and proper sealing performance.
Maintenance Tips
- Inspect regularly for leaks, corrosion, or signs of external damage.
- Test annually to verify proper double-check backflow prevention and code compliance.
- Use EZSwap vessel feature for faster servicing and reduced downtime during maintenance.
- Flush the system periodically to minimize sediment and debris buildup.
- Replace worn seals, O-rings, or check modules using approved repair kits when needed.
- Keep the assembly accessible and protected from freezing conditions for reliable performance.
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