The Watts LFN388 1/4 is a 1/4" lead-free anti-siphon (atmospheric) vacuum breaker with FNPT connections, approved for high health hazard protection. It features a copper body and a silicone seat. Rated to 125 psi and 33°F to 180°F. This model is certified lead-free for potable-water installations.
This 1/4 inch lead free anti-siphon hot or cold water vacuum breaker backflow preventer prevents the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. It consists of lead free construction, chemical resistant silicone seat disc, chrome hood, and an atmospheric vent to prevent spilling. It has a full size orifice to assure pipe size capacity and maximum flow. It is ideal for low flow, non-continuous hot or cold water health hazard installations such as on laboratory equipment.
Features
- Lead free construction
- Full size orifice for maximum flow
- Female NPT inlet and outlet
- Hot or cold water
Common Questions
- What hazard level is this AVB approved for?
- It is rated for high health hazard (toxic) cross-connections, but only against backsiphonage. The assembly is listed to ASSE 1001.
- 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.
- Can this device be field tested?
- No. It has no test cocks and is not a testable assembly, so it cannot be certified by a backflow tester. Where a jurisdiction requires an annually tested device, specify a testable assembly (double check, RPZ, or PVB) instead.
- Will this protect against backpressure?
- No. An anti-siphon (atmospheric) 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. It also may not be used under continuous pressure: the supply downstream of it must not stay pressurized for more than 12 hours in any 24-hour period.
- 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
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Type: AVB
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Size: 1/4"
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Inlet Size: 1/4"
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Outlet Size: 1/4"
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Connection: FNPT
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Body Material: Copper
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Seat / Seal Material: Silicone
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Max Pressure (psi): 125
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Application: Domestic Water
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Backflow Protection: Backsiphonage
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Operation: Non-Continuous
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Pack Quantity: 50
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Country of Origin: Mexico
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Warranty: 1 Year Limited
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MPN: LFN388 1/4
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Temperature: 33°F to 180°F
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Certifications: ASSE-1001, CSA-B64
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Lead-Free: Yes
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Assembly Type: AVB
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Hazard Protection Level: High Health Hazard
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ASSE Standard: ASSE 1001
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USC FCCCHR Approved: No
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Field Testable: No
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Number of Test Cocks: 0
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Shutoff Valves: None
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Approved Orientation: Vertical
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Flood Sensor (SentryPlus Alert): No
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Strainer Included: No
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Air Gap Fitting Included: No
