Zurn Wilkins 375XL 1-inch Reduced-Pressure Backflow Preventer - 1-375XL
The Wilkins 375XL 1-inch Reduced Pressure Principle (RPZ) backflow preventer delivers high-hazard protection for potable water systems. Designed for ease of service, the assembly features a removable EZSwap pressure vessel, FNPT end connections, and quarter-turn ball valves that simplify installation, flushing, and testing.
Built for commercial, irrigation, and municipal applications, the 375XL balances serviceability and long-term performance. Optional blow-out/flush fittings and readily available repair kits simplify field maintenance and winterization. See the specification sheet and installation manual for complete dimensions, weight, and installation instructions.
Features
- Nominal size: 1-inch (FNPT end style) with full-port flow to minimize pressure loss.
- Durable EZSwap reinforced-nylon composite pressure vessel — removable for fast flushing and testing.
- Lead-free construction (ANSI/NSF 372 compliant) with minimal bronze components to deter theft.
- Performance: 175 psi working pressure, 180°F maximum temperature, and 350 psi hydrostatic test pressure.
- Certifications and listings include ASSE 1013, cUL/IAPMO, and AWWA compatibility for potable water systems.
What our Experts Think
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Maximum backflow protection: RPZ (Reduced Pressure Zone) design provides one of the highest levels of cross-connection safety available for drinking water systems.
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Serviceable modular cartridge system: Internal check and relief components are designed for fast removal and replacement, reducing downtime during maintenance.
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Lead-free, potable-water compliant: Built for safe use in municipal, residential, and commercial plumbing systems.
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Winterization-friendly design: Cartridge can be removed to help prevent freeze damage and simplify seasonal servicing.
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Durable construction: Heavy-duty bronze body and engineered internal assembly designed for long-term performance under demanding conditions.
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Code-approved reliability: Meets major certifications including ASSE 1013 and NSF/ANSI standards for backflow prevention use.
Q&A
Q: What is the Zurn Wilkins 375XL 1-inch used for?
A: A reduced-pressure zone (RPZ) backflow preventer designed to protect potable water systems from high-hazard contamination caused by backpressure or backsiphonage.
Q: Does it protect drinking water?
A: Yes. It is lead-free and certified for potable water applications under NSF/ANSI 61 and ASSE 1013 standards.
Q: What makes the 375XL different from standard backflow preventers?
A: It provides high-level protection using a dual-check + relief valve system that safely discharges water if unsafe pressure conditions occur.
Q: What size and connection type is this model?
A: 1-inch FNPT threaded connections, commonly used in residential and light commercial plumbing or irrigation systems.
Q: Is it easy to maintain?
A: Yes. It features a removable cartridge/EZSwap-style design that allows faster inspection, testing, and winterization.
Q: What materials is it made from?
A: Lead-free bronze body with corrosion-resistant internal components designed for long service life in outdoor and buried utility environments.
Q: Where is it commonly installed?
A: Irrigation systems, fire protection lines, and any application requiring high-hazard cross-connection control.
Maintenance Tips
Damage 
Loss 
Theft 
