Description
Zurn Wilkins 4-375OSY 4″ Reduced Pressure Principle Assembly (RP) Backflow Preventer – OS&Y Gate Valves, Lead-Free, Flange x Flange
Product Overview
The Zurn Wilkins 4-375OSY Reduced Pressure Principle Assembly (RPZ) Backflow Preventer provides high hazard protection for potable water systems. With a flanged ductile iron body, OS&Y gate valves, and lead-free construction, it’s engineered to stop both backsiphonage and backpressure from introducing contaminants into drinking water.
Built with a short lay length for tight installations, a low headloss compound check for improved performance, and a single access cover for easier servicing, the 4-375OSY is a proven choice for commercial and industrial backflow prevention.
Features & Benefits
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4″ RPZ Backflow Preventer with OS&Y gate valves for maximum reliability
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Short lay length simplifies installation in confined spaces
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Low headloss design improves flow performance in demanding systems
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Epoxy-coated ductile iron body resists corrosion and extends service life
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Single access cover allows quick maintenance without full disassembly
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Flexible connection options with flange x flange ends
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Lead-free compliant to meet potable water standards
Specifications
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Size: 4″
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End Connections: Flanged, ANSI B16.1 Class 125
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Maximum Working Pressure: 175 PSI
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Maximum Temperature: 140°F
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Hydrostatic Test Pressure: 350 PSI
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Body Material: Ductile Iron, ASTM A 536 with FDA-approved epoxy finish
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Internals: Stainless steel, NORYL™, EPDM seals, Buna-N O-rings
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Sensing Line: Stainless steel braided hose
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Shutoff Valves: OS&Y gate valves (lead-free)
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Certifications:
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ASSE® 1013
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AWWA C511 & C550
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IAPMO® Listed
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CSA® Certified
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UL® Classified / C-UL® Classified
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FM® Approved
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USC FCCCHR Approved
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Meets NSF/ANSI/CAN 61 (≤0.25% weighted average lead content)
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Installation Tips
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Install in accordance with local codes and plumbing standards.
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Mount assembly 12″–30″ above floor drains with adequate clearance for testing and service.
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Ensure relief valve discharge is piped to a safe drainage point.
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Avoid submersion of any part of the assembly.
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Test the backflow preventer upon installation and perform routine annual testing.
FAQs
Q: What type of protection does the 4-375OSY provide?
A: It protects potable water systems from high hazard backflow conditions, including both backsiphonage and backpressure.
Q: Can this unit be installed in tight spaces?
A: Yes, its short lay length design makes it ideal for confined installation areas.
Q: Are the OS&Y gate valves included?
A: Yes, this model comes with flanged OS&Y shutoff valves.
Q: Is it compliant with lead-free potable water standards?
A: Yes, it meets NSF/ANSI/CAN 61 requirements with ≤0.25% weighted average lead content.
Q: How often should it be tested?
A: Backflow preventers should be tested at installation and at least annually to maintain compliance.
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