Zurn Wilkins Model 350 Double-Check Valve Assembly, 3/4 in Bronze - 34-350FT

Zurn  Wilkins Model 350 Double-Check Valve Assembly, 3/4 in Bronze - 34-350FT

The Wilkins Model 350 double-check valve assembly is a durable, serviceable backflow preventer designed for potable water protection where a low health hazard exists. Built with bronze bodies for 3/4" sizes and reinforced nylon housings for internal components, the 350 balances corrosion resistance with easy maintenance. It features full-port ball shutoff valves, top-mounted test cocks, and an EZSwap removable pressure vessel that reduces repair time and simplifies winterization and flushing.

Ideal for irrigation and commercial plumbing where reliable backflow protection is required without a high health hazard, the Model 350 provides proven double-check protection with parts and repair kits widely available. Follow manufacturer installation and local code requirements for mounting height, drainage, and periodic testing; use the included technical specs and installation instructions for service intervals and replacement parts.

Features

• Reliable construction: Cast bronze main valve body (3/4" and 1") with stainless steel fasteners for corrosion resistance and long field life.
• Serviceable design: Removable EZSwap pressure vessel permits safe line flushing, quick winterization, and fast on-site repairs without removing the assembly from the line.
• Fast-test capability: Top-mounted SAE test cocks and full-port ball valves allow efficient testing and shutoff during service.
• Performance ratings: Typical ratings include 175 PSI maximum working pressure and 350 PSI hydrostatic test pressure; temperature range supports common potable water applications.
• Compliance: ASSE Listed 1015 and recognized by IAPMO and CSA (B64.5); designed to meet federal low-lead guidelines for potable water installations.
• Easy installation: Compact footprint for 3/4" service, optional strainers and accessory kits available to simplify connection and protection on new or retrofit systems.

What our Experts Think

• Reliable 3/4" double-check valve assembly (DCVA) designed for non-health hazard backflow prevention in potable water systems.
• Durable bronze body construction ensures long-term corrosion resistance and field durability.
• Compact design makes it ideal for residential and light commercial plumbing applications.
• Provides effective protection against backpressure and back-siphonage conditions.
• Includes top-access test cocks and resilient seated check modules for easier testing and maintenance.
• Engineered for low head loss performance, helping maintain system efficiency.
• Suitable for irrigation, fire sprinkler, and domestic water systems where code requires backflow protection.
• Built to meet industry standards for safety, reliability, and regulatory compliance.
• A trusted choice for installers seeking a serviceable, long-lasting backflow prevention solution.

Q&A

Q: What is the Zurn Wilkins Model 350 3/4" Double Check Valve Assembly (34-350FT)?
A: A 3/4" bronze double check valve assembly designed to prevent backflow of contaminated water into potable water systems in low-hazard applications like irrigation and commercial plumbing.

Q: Where is the 34-350FT commonly used?
A: Ideal for irrigation systems, fire sprinkler lines, and non-potable or low-health-hazard water applications requiring backflow protection.

Q: What are its key features?
A: Bronze body construction, full-port shutoff ball valves, top-mounted test cocks, and EZSwap removable pressure vessel for easier maintenance, flushing, and winterization.

Q: What makes the EZSwap design useful?
A: It allows quick removal and replacement of the internal pressure vessel for off-line servicing, reducing downtime and simplifying maintenance.

Q: What are the operating specifications?
A: Typically rated around 175 PSI working pressure and up to 350 PSI hydrostatic test pressure, with threaded FNPT connections. 

Maintenance Tips

• Inspect regularly for leaks, corrosion, and external damage.
• Test annually to ensure proper backflow prevention performance and code compliance.
• Flush the system periodically to remove sediment and debris buildup.
• Clean or replace internal check components if sticking or reduced flow is observed.
• Replace worn seals, gaskets, or O-rings with compatible repair kits as needed.
• Keep the assembly accessible and protected from freezing conditions for reliable operation.