Watts LF709-NRS-IOT 4 Lead-Free Double Check Backflow Preventer, Cast Iron

The Watts LF709-NRS-IOT 4 is a 4" lead-free double check valve assembly, approved for low health hazard protection. It features a cast iron body. Rated to 175 psi. This model is certified lead-free for potable-water installations.

This 4 inch lead free double check valve backflow preventer assembly is designed to prevent the reverse flow of contaminated water of non-potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure. Ideal for protection in continuous pressure piping applications and cross-connections identified as non-health hazards. This assembly consists of an fused epoxy coated cast iron body, NRS resilient seated gate valves, test cocks, and a modular check design for easy maintenance with center stem guide. The captured spring is accessible through a bolted cover plate. This assembly features integrated pressure-sensing test cocks that measure pressure fluctuations at three points when activated with an add-on monitoring connection kit. The kit collects, converts, and transmits the data values for use in a building management system. The coating on this backflow assembly uses ArmorTek®, a patented 3-part advanced epoxy coating system designed to limit both microbial induced (MIC) and exposed metal substrate corrosion.

Features

• Pressure sensors integrated on the backflow preventer to measure pressure fluctuations at three test cock locations when activated
• Add-on kit available for activating sensors and transmitting data values to a building management system
• A solution for monitoring assembly performance between code testing
• Data access to help drive scheduling of maintenance and repair
• Utilizes advanced ArmorTek coating technology to resist corrosion of internals
• Cast iron body construction with patented 3-part advanced epoxy coating system designed to limit both microbial induced (MIC) and exposed metal substrate corrosion
• Non-rising stem gate valves
• Includes: Test Cocks

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 substance downstream could be a health hazard, codes require a reduced pressure zone (RPZ) 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 FM Approved, the listings normally required for a backflow device on a fire sprinkler supply.

Specifications

• Type: Double Check
• Size: 4"
• Inlet Size: 4"
• Outlet Size: 4"
• Body Material: Cast Iron
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• Operation: Continuous
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LF709-NRS-IOT 4
• Certifications: ASSE-1015, CSA-B64, UL, FM, USC, 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;FM Approved
• Field Testable: Yes
• Number of Test Cocks: 4
• Shutoff Valves: NRS Gate
• Flood Sensor (SentryPlus Alert): No
• Strainer Included: No
• Air Gap Fitting Included: No