Watts LF800M4-QT-FZ 1/2 Lead-Free Pressure Vacuum Breaker, FNPT

The Watts LF800M4-QT-FZ 1/2 is a 1/2" lead-free pressure vacuum breaker with FNPT connections, approved for high health hazard protection. It features a silicone seat. Rated to 150 psi. This model is certified lead-free for potable-water installations.

This 1/2 inch lead free anti-siphon pressure vacuum breaker backflow preventer prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of a lead free cast copper silicon alloy body construction, silicone rubber check valve disc, plastic check valve seat, stainless steel springs, a bonnet with silicone rubber O-ring seal, a lightweight plastic disc float, tee handle shutoff, and test cocks for winterization draining. It is ideal in health hazard continuous pressure applications such as irrigation systems and industrial process water systems where the water enters the equipment at or below its flood rim. The maximum pressure is 150 psi (10.3 bar) and the minimum pressure is 15 psi (55 kPa). The pressure vacuum breaker includes a freeze sensor for use with SentryPlus Alert® technology to signal facility personnel when temperature nears and reaches the freezing point. Freeze alerts feature available with add-on connection kit for Wi-Fi networks, building management systems (BMS), irrigation management systems (IMS).

Features

• Includes a freeze sensor for use with SentryPlus Alert technology to signal facility personnel when temperature nears and reaches the freezing point
• Available freeze sensor connection kit to activate a monitoring system that trigger alerts for low and freezing temperatures
• Lead free construction
• Replaceable seat
• Freeze alerts feature available with add-on connection kit for Wi-Fi networks, building management systems (BMS), and irrigation management systems (IMS)
• Female NPT inlet and outlet with quarter turn shutoffs
• Easy internal access
• Includes: Test Cocks

Common Questions

What hazard level is this PVB approved for?

It is rated for high health hazard (toxic) cross-connections, but only against backsiphonage. The assembly is listed to ASSE 1020.

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. Most water authorities require it to be tested and certified by a licensed backflow tester at installation and annually thereafter.

Will this protect against backpressure?

No. A pressure vacuum breaker protects against backsiphonage only. It will not stop backflow caused by backpressure — a downstream pump, elevated piping or a boiler — which requires a double check or RPZ assembly.

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 must be installed vertically (upright), above the highest downstream outlet, per the installation instructions and its ASSE listing.

Specifications

• Type: PVB
• Size: 1/2"
• Inlet Size: 1/2"
• Outlet Size: 1/2"
• Connection: FNPT
• Seat / Seal Material: Silicone
• Max Pressure (psi): 150
• Application: Domestic Water
• Backflow Protection: Backsiphonage
• Operation: Continuous
• Country of Origin: United States
• Warranty: 1 Year Limited
• MPN: LF800M4-QT-FZ 1/2
• Lead-Free: Yes
• Assembly Type: PVB
• Hazard Protection Level: High Health Hazard
• ASSE Standard: ASSE 1020
• Field Testable: Yes
• Shutoff Valves: Quarter-Turn Ball
• Approved Orientation: Vertical
• Flood Sensor (SentryPlus Alert): No
• Strainer Included: No
• Air Gap Fitting Included: No