The Zurn Wilkins 3-375ASTOSY is a 3" lead-free reduced pressure zone (RPZ) backflow preventer with Flanged connections, approved for high health hazard protection. It features a stainless body. Rated to 175 psi and up to 140°F. This model is certified lead-free for potable-water installations.
The 375AST Reduced Pressure Principle Backflow Assembly is utilized in high hazard applications for all applications and market segments, protecting against backsiphonage and backpressure of contaminated water into the potable water supply. The 375AST offers lightweight design with a high quality, 304L grade stainless steel valve body and sensing line, plus stainless steel internals, fasteners, and springs. Multiple options for end connections, such as NRS, OS&Y, and Butterfly shut-off valves, offer supreme installation versatility, and its corrosion-resistant design saves you money on maintenance costs.
Features
- Flanged, grooved, or grooved x flanged end connections provide versatile installation
- Short lay-length offers reduces installation time and costs in compact spaces
- Patented Compound Check offers reliable performance, improved flow characteristics, and installation in lower-pressure systems
- Stainless steel body protects against corrosion
- ASSE® Listed 1013
- AWWA Compliant C511 (with gates only), and C550
- UL® and C-UL® Classified
Common Questions
- What hazard level is this RPZ approved for?
- It is rated for high health hazard (toxic) cross-connections, so it may be used on either high or low hazard service. The assembly is listed to ASSE 1013.
- Is this model legal for potable water?
- Yes. It is certified lead-free to NSF/ANSI 372, which is what state plumbing codes require for any device in a drinking-water line.
- Does this assembly have to be tested every year?
- Yes. This is a field-testable assembly with 4 test cocks. Most water authorities require it to be tested and certified by a licensed backflow tester at installation and annually thereafter. It carries USC FCCCHR approval, which many jurisdictions accept as their sole approval list.
- What shutoff valves are included?
- It is supplied with outside screw and yoke (OS&Y) gate valves on the inlet and outlet. OS&Y gates give the visible open/shut indication that fire-line and many water-authority specs require.
- Is this listed for fire protection service?
- Yes -- it is UL Classified and C-UL Classified and FM Approved, the listings normally required for a backflow device on a fire sprinkler supply.
- Does the relief valve need a drain?
- Yes. An RPZ relief valve is designed to discharge, and it can dump a large volume of water, so it must never be installed in a pit or below grade and the discharge must be piped to an adequate drain through an air gap. The air gap fitting is not included with this model and is ordered separately. This model is connectable to a flood/discharge sensor, which signals a relief-valve discharge before it becomes a flood.
Specifications
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Type: Backflow Preventer - Stainless Steel Reduced Pressure Principle Assembly
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Size: 3"
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Connection: Flanged
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Body Material: Stainless
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Max Pressure (psi): 175
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Application: Domestic Water
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Backflow Protection: Both
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MPN: 3-375ASTOSY
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Temperature: up to 140°F
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Certifications: ASSE-1013, AWWA-C511, AWWA-C606, CSA-B64.4, C-UL, UL, FM, USC, NSF-61, NSF-372, IAPMO
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Lead-Free: Yes
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Assembly Type: RPZ
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Hazard Protection Level: High Health Hazard
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ASSE Standard: ASSE 1013
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USC FCCCHR Approved: Yes
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Fire Protection Listing: UL Classified;C-UL Classified;FM Approved
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Field Testable: Yes
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Number of Test Cocks: 4
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Shutoff Valves: OSY Gate
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Flood Sensor: Yes
