Zurn 3-350 Lead-Free Backflow Preventer - Ductile Iron Double Check Valve Assembly

The Zurn Wilkins 3-350 is a 3" 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 Wilkins 350 Double Check Valve Backflow Preventer provides low hazard protection for all applications. The flanged, epoxy coated ductile iron body is available with multiple shut-off valve options for installation versatility.

Features

• 350 (2 1/2"-12")
• Short lay-length and multiple connection options provide versatile installation in compact spaces
• Single access cover eases access, reducing maintenance costs and downtime
• Patented Compound Check offers reliable performance and improved flow characteristics
• Complete epoxy coating inside and outside of valve body eliminating exposure to corrosion
• ASSE® Listed 1015, CSA® Certified B64.5 and cUPC® Listed
• AWWA C510 Compliant
• 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 non-rising stem (NRS) resilient-seated gate valves on the inlet and outlet.

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.

Specifications

• Type: Backflow Preventer - Ductile Iron Double Check Valve Assembly
• Size: 3"
• Connection: Flanged
• Body Material: Ductile Iron
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• MPN: 3-350
• 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: NRS Gate