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Small brass atmospheric vacuum breaker with threaded FNPT connection

Watts

Watts LFN388-C Atmospheric Vacuum Breaker 3/8 FNPT

SKU CH-553D-ZKT69

Atmospheric vacuum breaker with 3/8 FNPT connection, low-lead brass body, silicone seal, rated 125 psi and 180 °F, meeting ASSE 1001 and CSA B 64.1 standards

  • TypePipes, Valves & Fittings
  • Prevents backflow with ASSE 1001 certified atmospheric vacuum breaker
  • Handles 125 psi working pressure for reliable residential performance
  • Withstands 180 degrees Fahrenheit water temperature for hot supply lines
  • Low-lead brass construction meets CSA B64.1.1 and UPC compliance standards
  • Compact 3/8-inch FNPT connection installs easily in tight spaces

Atmospheric Vacuum Breaker 3/8 FNPT

The Watts LFN388-C atmospheric vacuum breaker protects potable water supplies from backsiphonage. It installs on 3/8 inch FNPT connections in residential and light commercial plumbing systems. Low lead brass construction meets current drinking water regulations. The device is suited for contractors and facility managers needing code compliant cross connection control.

Thermal pressure limits and sealing

The breaker operates up to 125 psi and withstands water temperatures to 180 degrees F. A silicone seal maintains reliable closure during normal pressure fluctuations. The disc float mechanism vents atmosphere to break vacuum without external power. No electrical consumption or noise is generated during operation.

Standards compliance and installation

The unit carries ASSE 1001, cCSAus, CSA B64.1.1 and UPC certifications for inspection approval. Low lead brass material satisfies lead free requirements in restricted jurisdictions. The 2 3/8 inch height and 1 3/4 inch width fit standard piping layouts. No additional accessories or software are bundled with the valve.

Highlights

  • Prevents backflow with ASSE 1001 certified atmospheric vacuum breaker
  • Handles 125 psi working pressure for reliable residential performance
  • Withstands 180 degrees Fahrenheit water temperature for hot supply lines
  • Low-lead brass construction meets CSA B64.1.1 and UPC compliance standards
  • Compact 3/8-inch FNPT connection installs easily in tight spaces

Specifications

BrandWATTS
TypePipes, Valves & Fittings

Questions about this item

How do I install the 3/8 FNPT atmospheric vacuum breaker without cross-threading the low-lead brass body?

Apply PTFE tape clockwise on the male threads, hand-tighten the breaker into the female port, then finish with one wrench turn — over-tightening distorts the silicone seal and cracks the brass.

When will the silicone disc float need replacement in normal service?

The silicone disc float typically lasts several years; replace it when the seal no longer reseats after flow stops or when water seeps past the vent during back-siphonage tests.

At what pressure does the 125 psi rated valve vent first during sustained back-pressure?

The atmospheric vent opens whenever downstream pressure exceeds supply pressure, well before the 125 psi body rating is reached; sustained pressure above 125 psi risks permanent deformation of the low-lead brass housing.

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