Watts LF719-QT-S 1/2 Lead-Free Double Check Backflow Preventer, Copper, NPT

The Watts LF719-QT-S 1/2 is a 1/2" lead-free double check valve assembly with NPT connections, approved for low health hazard protection. It features a copper body and a rubber seat. Rated to 175 psi. This model is certified lead-free for potable-water installations.

This 1/2 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 in accordance with national plumbing codes and water authority requirements. It is ideal for protection at cross-connections identified as non-health hazard applications and from other contaminants found at the service line entrance. This compact design with separate access top entry for easy maintenance is approved with the arrow on the valve pointing in the direction of flow for horizontal and vertical installations. This assembly consists of a lead free cast copper silicon alloy body, quarter turn ball valves with tee handles, NPT end connections, lead free bronze strainer, screw driver slotted test cocks, two replaceable positive seating check valves, and reversible rubber seat discs.

Features

• Lead free cast copper silicon alloy body construction
• Chloramine resistant elastomers
• Top mounted screwdriver slotted ball valve test cocks
• Reversible seat disc rubber, extends the check valve life
• Includes: Test Cocks
• Includes: Strainer

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 719 and 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 quarter-turn ball valves on the inlet and outlet.

How does this have to be installed?

It is approved for either horizontal or vertical installation, with the flow arrow on the body pointing in the direction of flow.

Specifications

• Type: Double Check
• Size: 1/2"
• Inlet Size: 1/2"
• Outlet Size: 1/2"
• Connection: NPT
• Body Material: Copper
• Seat / Seal Material: Rubber
• Max Pressure (psi): 175
• Application: Domestic Water
• Backflow Protection: Both
• Operation: Continuous
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LF719-QT-S 1/2
• Certifications: ASSE-1015, ASSE-719, USC
• Lead-Free: Yes
• Assembly Type: Double Check
• Hazard Protection Level: Low Health Hazard
• ASSE Standard: ASSE 719;ASSE 1015
• USC FCCCHR Approved: Yes
• Field Testable: Yes
• Number of Test Cocks: 4
• Shutoff Valves: Quarter-Turn Ball
• Approved Orientation: Horizontal & Vertical
• Flood Sensor (SentryPlus Alert): No
• Strainer Included: Yes
• Air Gap Fitting Included: No