Zurn 6-350AOSY Lead-Free Backflow Preventer - Double Check Valve Assembly

The Zurn Wilkins 6-350AOSY is a 6" lead-free double check valve assembly with Flanged connections, approved for low health hazard protection. It features a ductile iron body. Rated to 175 psi and up to 140°F. This model is certified lead-free for potable-water installations.

The 350A Double Check Backflow Assembly protects against backsiphonage and backpressure in low health hazard applications for all market segments. The use of our Patented Compound Check guarantees reliable performance and improved flow characteristics. The backflows single access cover reduces maintenance downtime, while the grooved, epoxy-coated ductile iron body provide corrosion-resistance. Its lightweight design and short lay-length ensures easy, compact installation. Choose from multiple shut-off and end connection options for installation versatility.

Features

• Patented Compound Check ensures reliable, long-lasting performance and improved flow characteristics
• Complete epoxy coating inside and outside of valve body eliminating exposure to corrosion
• Lightweight design and short lay-length ensures easy, compact installation
• ASSE® Listed 1015 and AWWA C510 Compliant
• cUPC® Listed and CSA® Certified B64.5
• UL® and C-UL® Classified
• Meets the requirements of NSF/ANSI/CAN 61 & 372

Common Questions

What hazard level is this Double Check approved for?

It is rated for low health hazard (non-toxic, "pollutant") cross-connections only. Where the downstream substance could be a health hazard, codes require a reduced pressure zone (RPZ) assembly or a detector assembly instead. The assembly is listed to ASSE 1015.

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.

How does this have to be installed?

It is approved for either horizontal or vertical installation, with the flow arrow on the body pointing in the direction of flow.

Specifications

• Type: Backflow Preventer - Double Check Valve Assembly
• Size: 6"
• Connection: Flanged
• Body Material: Ductile Iron
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• MPN: 6-350AOSY
• Temperature: up to 140°F
• Certifications: ASSE-1015, AWWA-C510, AWWA-C606, CSA-B64.5, C-UL, UL, FM, USC, NSF-61, NSF-372, IAPMO
• Lead-Free: Yes
• Assembly Type: Double Check
• Hazard Protection Level: Low Health Hazard
• ASSE Standard: ASSE 1015
• USC FCCCHR Approved: Yes
• Fire Protection Listing: UL Classified;C-UL Classified;FM Approved
• Field Testable: Yes
• Number of Test Cocks: 4
• Shutoff Valves: OSY Gate
• Approved Orientation: Horizontal & Vertical