Zurn 6-375A Lead-Free Backflow Preventer - Reduced Pressure Principle Assembly

The Zurn Wilkins 6-375A is a 6" lead-free reduced pressure zone (RPZ) backflow preventer with Flanged connections, approved for high 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 375A Reduced Pressure Principle Backflow Assembly is utilized where a potential high health hazard exists and is ideal for use when lead-free valves are required protecting against both backsiphonage and backpressure of contaminated water into the potable water supply. The 375A includes a lightweight, grooved, epoxy-coated ductile iron valve body eliminating exposure to corrosion. With multiple options for NRS, OS&Y, and Butterfly shut-off valves, the 375A utilizes the Wilkins low headloss Compound Check and offers the lowest lifecycle costs on the market.

Features

• Multiple shut-off valve options for every application eases installation
• Complete epoxy coating inside and outside of valve body eliminating exposure to corrosion
• Utilizes Wilkins low headloss compound check for reliable and superior performance
• Low-lead law compliant
• ASSE® Listed 1013
• AWWA Compliant C511 (with gates only), and C550
• IAPMO® Listed
• CSA® Certified

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 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.

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

• Type: Backflow Preventer - Reduced Pressure Principle Assembly
• Size: 6"
• Connection: Flanged
• Body Material: Ductile Iron
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• MPN: 6-375A
• Temperature: up to 140°F
• Certifications: ASSE-1013, AWWA-C511, AWWA-C606, CSA-B64.4, C-UL, UL, FM, USC, NSF-61, NSF-372, IAPMO
• Lead-Free: Yes
• Assembly Type: RPZ
• Hazard Protection Level: High Health Hazard
• ASSE Standard: ASSE 1013
• 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
• Flood Sensor: Yes