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Front-perspective of Wilkins 375XL 1-inch RPZ backflow preventer with removable EZSwap composite pressure vessel, FNPT connections, and lead-free finish.

Wilkins 375XL 1-inch Reduced-Pressure Backflow Preventer

Brand: Zurn Industries, LLC
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$1,480.26
$1,110.20
SKU 1-375XL

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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.

  • 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.

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.

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Frequently Asked Questions

What does 1-inch nominal size mean for this unit?
The 1-inch nominal size refers to pipe compatibility; the unit has FNPT ends and full-port flow for 1" pipe systems.
How does the EZSwap pressure vessel speed up flushing and testing?
The removable EZSwap vessel allows use of the flush-fitting tool to clear debris and test quickly, saving installation and service time.
Is this model suitable for outdoor and irrigation use?
Yes. The reinforced-nylon EZSwap vessel is UV-resistant and optional blow-out/flush fittings support winterization and outdoor service.

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