Zurn Wilkins 3-375ASTBG 3" RPZ Backflow Preventer | Stainless Body w/ Butterfly Valves

Zurn Wilkins 3" 375ASTBG RPZ Backflow Preventer | Stainless Steel & Butterfly Valves.

Product Overview:

The Zurn Wilkins 3" 375ASTBG is a premium Reduced Pressure Zone (RPZ) backflow preventer designed to ensure water safety in systems where health hazards pose serious risks. Featuring a durable 304L stainless steel body and supervised grooved butterfly valves, this assembly reliably stops harmful backpressure and backsiphonage in potable water systems. Engineered for both vertical and horizontal installations, it offers robust performance for commercial, industrial, and municipal applications.

Features & Benefits:

• Certified RPZ Protection: Dual checks with automatic relief valve for complete backflow prevention

• Space-Efficient Design: Short lay-length adapts easily to tight mechanical rooms

• Corrosion-Resistant Materials: Stainless steel body and epoxy-coated internals extend service life

• Lead-Free Construction: Compliant with NSF/ANSI 372 standards for potable water systems

• Supervised Butterfly Valves: Grooved installation allows quick shutoff with position monitoring

• Tool-Free In-Line Access: Check valves and relief valve can be serviced without removing the line

• Retrofit Compatible: Designed to replace older 300ASTR models easily

Specifications:

• Size: 3"

• Body & Covers: 304L Stainless Steel

• Internal Components: NORYL™, stainless steel, EPDM, Buna-N

• Max Working Pressure: 175 PSI

• Pressure Test: 350 PSI

• Temperature Range: Up to 140°F

• End Connections: Grooved (AWWA C606) or Flanged (ANSI B16.1 Class 125)

• Certifications: ASSE 1013, AWWA C511/C550, FM, UL, CSA, IAPMO, NSF 61/372

• Approval: Vertical and horizontal orientation supported

Installation Tips:

• Mount 12″–30″ above the floor with access to an adequate drain

• Leave clearance for butterfly valve levers and check valve access

• Ensure relief valve discharge is piped to a visible, approved drain

• Follow local codes concerning vaults, freeze protection, and orientation

• Reference Zurn’s installation, maintenance, and butterfly valve adjustment manuals for detailed guidance

FAQs:

Q: How does this RPZ prevent backflow?
A: It uses two sequential check valves and an intermediate relief zone to stop contaminated water from re-entering the clean line.

Q: What makes the butterfly valves supervised?
A: The lever position can be monitored, ensuring valves remain in the correct open or closed position during operation.

Q: Can I service internal parts without removing the unit?
A: Yes, both check components and the relief valve are accessible in-line, reducing service time and complexity.

Q: Is this assembly lead-free?
A: Yes, it is fully compliant with NSF/ANSI 372 for potable water use.

Q: Does it fit in place of older Zurn models?
A: Yes, installation-compatible with 300ASTR models for easy retrofitting.