Zurn 4-375ADA Backflow Preventer - Reduced Pressure Principle Detector Assembly

The Zurn Wilkins 4-375ADA is a 4" reduced pressure detector assembly (RPDA) with Flanged connections, approved for high health hazard protection. It features a ductile iron body. Rated to 175 psi and up to 140°F.

The Wilkins 375ADA Reduced Pressure Detector Assembly Backflow Preventer with epoxy coated ductile iron body provides high hazard protection and is ideal for fire protection applications, with a metered by-pass to detect leaks and unauthorized water use.

Features

• Meters unauthorized water use in Fire lines
• Grooved or Flanged end connection options
• Available with tamper switch equipped butterfly valves

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.

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

• Type: Backflow Preventer - Reduced Pressure Principle Detector Assembly
• Size: 4"
• Connection: Flanged
• Body Material: Ductile Iron
• Max Pressure (psi): 175
• Application: Fire Protection
• Backflow Protection: Both
• MPN: 4-375ADA
• Temperature: up to 140°F
• Certifications: ASSE-1047, AWWA-C550, AWWA-C606, CSA-B64.4, C-UL, UL, FM, USC, NSF-61
• Assembly Type: RPDA
• Hazard Protection Level: High Health Hazard
• ASSE Standard: ASSE 1047
• USC FCCCHR Approved: Yes
• Fire Protection Listing: UL Classified;C-UL Classified;FM Approved
• Field Testable: Yes
• Shutoff Valves: NRS Gate
• Bypass Meter: GPM