Zurn Wilkins 375 Reduced Pressure RPZ Backflow Preventer - 1" 1-375

Zurn Wilkins 375 Reduced Pressure RPZ Backflow Preventer - 1" 1-375 

The Wilkins 375 Reduced Pressure Principle (RPZ) Backflow Preventer, model 1-375, is a 1-inch assembly engineered for high-hazard, non-potable applications. Rated to 175 PSI, this compact RPZ uses a serviceable pressure vessel and modular check assemblies to simplify maintenance and reduce downtime. Its flanged, epoxy-coated ductile iron body and durable internals are built for outdoor irrigation, fireline, and industrial use where protection against back-pressure and back-siphonage is required.

Refer to the manufacturer specification sheet and installation manual for exact dimensions, connection options, and accessory part numbers. The standard 1-375 contains leaded components and is not intended for potable water systems; choose the 375XL lead‑free variant when low‑lead compliance is required. Have installation and annual testing performed by a licensed backflow technician to maintain compliance and reliable operation.

Features

• Size & Capacity: 1-inch nominal size; maximum working pressure 175 PSI; compact form factor for tight installations.
• Serviceability: EZSwap-style removable pressure vessel and modular checks allow faster flushing, easier servicing, and off‑line repairs.
• Construction: Epoxy-coated ductile iron body with durable internals and corrosion-resistant fasteners for long field life.
• Certifications & Standards: ASSE 1013, IAPMO, CSA B64.4, and AWWA-compliant design (check specific listings for variants).
• Applications: Ideal for irrigation, landscape, commercial non-potable lines, and other high-hazard installations where lead-free certification is not required.

What our Experts Think

• True RPZ protection: Uses a reduced pressure zone design to protect against both back-siphonage and backpressure contamination in potable water systems.
• High-hazard certified performance: Built for applications where contamination risk is significant, such as irrigation, fire protection, and industrial service lines.
• Serviceable modular internals: Features a replaceable pressure vessel and check assemblies for faster maintenance and reduced downtime.
• Durable, corrosion-resistant build: Epoxy-coated ductile iron body designed for long-term reliability and protection in harsh environments.
• Compact 1" footprint: Ideal for tight mechanical spaces while still delivering full RPZ-level protection.
• Low lifecycle maintenance design: Engineered for field serviceability, reducing long-term operating costs compared to fully non-serviceable assemblies.

Q&A

Q: What is the Zurn Wilkins 1-375 used for?
A: A 1" lead-free reduced pressure zone (RPZ) backflow preventer designed to protect potable water systems from high-hazard contamination caused by backpressure or backsiphonage.

Q: Is it approved for drinking water use?
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 contaminated water from entering the clean supply.

Q: What makes the 375 series design notable?
A: It uses a modular, serviceable pressure vessel system designed for easier flushing, testing, and maintenance, helping reduce downtime and service effort.

Q: What are its pressure and performance ratings?
A: Typically rated up to 175 PSI working pressure and suitable for standard potable water and irrigation applications.

Q: What materials is it made from?
A: Lead-free bronze or ductile iron body with corrosion-resistant internal components for long-term durability in demanding installations.

Q: Where is it commonly used?
A: Irrigation systems, commercial plumbing, fire protection lines, and other high-hazard cross-connection control applications requiring RPZ-level protection.

Maintenance Tips