The Zurn Wilkins 6-475STDA is a 6" lead-free reduced pressure detector assembly (RPDA) with Flanged connections, approved for high health hazard protection. It features a stainless body. Rated to 175 psi. This model is certified lead-free for potable-water installations.
The Wilkins 475STDA Stainless Steel n-Pattern Reduced Pressure Detector Assembly (RPDA) withstands the corrosive effects of water and is ideal for new or direct drop-in replacement delivering convenience without compromise. For fire protection applications, with a metered by-pass to detect leaks and other water use.
Features
- Superior stainless steel body resists corrosion and extends the life of the product
- Small, compact footprint allows for direct drop-in replacement
- Time-tested check and relief valve components ensure easy maintenance and more water system uptime
- Patented compound checks provide ultra-low pressure drop as documented by approval authorities, reducing the need for a booster pump
- Patented AR spool for drop-in replacements, matching lay-lengths of common n-pattern valves
- AR spool maintains agency approvals when installed by the factory
- Backflow setter eliminates the need for concrete thrust blocks, allowing for easier installation and lower cost
- Available in sizes 4 in. through 10 in.
Common Questions
- What hazard level is this RPDA 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 1047.
- 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. 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 non-rising stem (NRS) resilient-seated gate valves on the inlet and outlet.
- Is this suitable for a fire sprinkler line?
- Yes. Detector assemblies are built for fire sprinkler service: the metered bypass registers the low flows that reveal a leak or an unauthorized tap on the fire line. This model is UL Classified and C-UL Classified and FM Approved. The bypass meter reads in GPM.
- 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.
Specifications
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Type: Reduced Pressure Detector Assembly
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Size: 6"
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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: Fire Protection
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Backflow Protection: Both
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MPN: 6-475STDA
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Certifications: ASSE-1047, AWWA-C550, AWWA-C606, CSA-B64.4, C-UL, UL, FM, USC, NSF-61, NSF-372
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Lead-Free: Yes
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Assembly Type: RPDA
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Hazard Protection Level: High Health Hazard
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ASSE Standard: ASSE 1047
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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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Shutoff Valves: NRS Gate
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Bypass Meter: GPM
