Zurn 1-375ST Lead-Free Backflow Preventer - Reduced Pressure Principle, Stainless Steel

The Zurn Wilkins 1-375ST is a 1" lead-free reduced pressure zone (RPZ) backflow preventer with Flanged connections, approved for high health hazard protection. It is rated to 175 psi and up to 180°F. This model is certified lead-free for potable-water installations.

The 375ST Reduced Pressure Principle Backflow Preventer offers high hazard protection against both backsiphonage and backpressure of contaminated water into the potable water supply. Materials include engineered plastic construction and quality 300 series stainless steel fasteners, springs, ball valves, and struts. The 375ST is utilized in systems where liquids are corrosive to copper alloys like bronze valves, including medical diagnostic equipment applications, food processing, distilleries, and breweries. It comes standard with full port QT ball valves, and features a maximum working water pressure of 175 psi, maximum working water temperature of 180°F, and hydrostatic test pressure of 350 psi.

Features

• All stainless steel and engineered plastic construction resists corrosion
• Repair Kits provide cost savings by avoiding full Backflow Preventer replacement
• Applicable for systems that are corrosive to bronze valves
• Excellent for food service use
• Low-lead law compliant
• ASSE® Listed 1013
• Approved by the Foundation for Cross Connection Control and Hydraulic Research at the University of Southern California

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.

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

• Type: Backflow Preventer - Reduced Pressure Principle, Stainless Steel
• Size: 1"
• Connection: Flanged
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• MPN: 1-375ST
• Temperature: up to 180°F
• Certifications: ASSE-1013, CSA-B64.4, USC, NSF-61, NSF-372
• Lead-Free: Yes
• Assembly Type: RPZ
• Hazard Protection Level: High Health Hazard
• ASSE Standard: ASSE 1013
• USC FCCCHR Approved: Yes
• Field Testable: Yes
• Number of Test Cocks: 4
• Shutoff Valves: NRS Gate