Zurn Wilkins 34-375 3/4" RPZ Reduced Pressure Backflow Assembly - 34-375
The Wilkins 34-375 3/4" Reduced Pressure Zone (RPZ) backflow assembly delivers high-hazard protection for potable water systems by preventing backsiphonage and backpressure contamination. Designed for irrigation and commercial applications, it balances reliable performance with low lifecycle maintenance costs.
Complete documentation is available: installation and maintenance instructions, specification sheet, and repair parts lists. The 34-375 is compatible with Wilkins replacement parts and the OEM RK34-375V pressure vessel for fast servicing and part replacement.
Features
- 175 psi maximum working pressure; temperature range 33°F to 180°F for versatile installation.
- Bronze valve body with EZSwap® removable pressure vessel—durable, corrosion-resistant construction.
- Flush fitting tool and removable vessel enable faster flushing, testing, winterization, and service.
- Includes two full-port ball shut-off valves and four ball valve test cocks for straightforward field testing.
- Threaded FNPT connections (3/4") and in-line serviceable design minimize downtime during repairs.
- Standards: ASSE 1013, IAPMO listed, CSA B64.4, and AWWA compliant C511 for code acceptance.
What our Experts Think
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True RPZ protection (high hazard rated): Uses a reduced-pressure zone design to prevent both back-siphonage and backpressure contamination in drinking water systems.
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Compact 3/4" configuration: Ideal for residential irrigation tie-ins, small commercial lines, and tight installation spaces where full-size assemblies aren’t practical.
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Lead-free potable water compliant: Built to meet modern low-lead plumbing requirements for safe use on municipal water supplies.
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Serviceable modular internals (EZSwap-style design): Internal pressure vessel and check components can be removed for faster maintenance, flushing, and winterization.
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Durable bronze body construction: Engineered for corrosion resistance and long-term reliability in outdoor and buried valve box environments.
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Low lifecycle maintenance focus: Designed to reduce downtime through replaceable internal assemblies rather than full-unit replacement.
Q&A
Q: What is the Zurn Wilkins 34-375 used for?
A: A 3/4" lead-free reduced pressure zone (RPZ) backflow preventer designed to protect potable water systems from high-hazard contamination due to backpressure or backsiphonage.
Q: Is it approved for drinking water systems?
A: Yes. It is lead-free compliant and certified to NSF/ANSI 61 and ASSE 1013 standards for potable water protection.
Q: What level of protection does it provide?
A: High-hazard protection using two check valves and a relief valve that discharges water if unsafe pressure conditions occur, preventing contamination from entering clean water lines.
Q: What makes the 34-375 design different?
A: It features an EZSwap® removable pressure vessel for faster service, flushing, and testing without full system disassembly.
Q: What are its pressure and temperature ratings?
A: Typically rated up to 175 PSI working pressure and about 180°F maximum operating temperature for residential and irrigation use.
Q: What materials is it made from?
A: Lead-free bronze body with corrosion-resistant internal components for durability in potable water and irrigation systems.
Q: Where is it commonly installed?
A: Irrigation systems, commercial water lines, and any high-risk cross-connection application requiring RPZ-level protection.
Maintenance Tips
Damage 
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