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Small brass atmospheric vacuum breaker with FNPT threads

Watts

Watts LFN388-C Atmospheric Vacuum Breaker 1/4 in FNPT

SKU CH-C4BA-P97N7

Atmospheric vacuum breaker with 1/4 in FNPT connection, low-lead brass body, silicone seal, 125 psi max pressure and 180 °F temperature rating

  • TypePipes, Valves & Fittings
  • Prevents back-siphonage with atmospheric vent design
  • Low-lead brass body meets ASSE 1001 and CSA B64.1.1
  • Silicone seal withstands 180 °F water temperature
  • Rated for 125 psi maximum working pressure
  • Compact 1/4 in FNPT fits tight plumbing spaces

Watts LFN388-C Vacuum Breaker Purpose

The Watts LFN388-C is an atmospheric vacuum breaker designed to prevent backsiphonage in potable water systems. It suits residential and light commercial plumbing where a 1/4 inch FNPT connection is required. Low-lead brass construction meets safe drinking water standards. The device operates automatically without external power.

Check Thread Size and Pressure Rating

Verify that your existing piping uses a 1/4 inch FNPT thread before ordering. Confirm the system pressure does not exceed 125 psi and that water temperature stays at or below 180 degrees Fahrenheit. Ensure local codes accept ASSE 1001 and CSA B64.1.1 compliance for this application.

Thermal and Pressure Performance

The valve handles continuous temperatures up to 180 degrees Fahrenheit and a maximum pressure of 125 psi. Silicone seals maintain integrity across this range without degradation. No moving parts require lubrication, so operational noise is negligible under normal flow conditions. Power draw is zero because the device is purely mechanical.

Highlights

  • Prevents back-siphonage with atmospheric vent design
  • Low-lead brass body meets ASSE 1001 and CSA B64.1.1
  • Silicone seal withstands 180 °F water temperature
  • Rated for 125 psi maximum working pressure
  • Compact 1/4 in FNPT fits tight plumbing spaces

Specifications

BrandWATTS
TypePipes, Valves & Fittings

Questions about this item

Does the LFN388-C include any pipe fittings or thread sealant?

The breaker is supplied as a single unit with FNPT threads; separate fittings and sealant must be purchased if your piping requires them.

Should I select a different size or pressure rating for my application?

This model is only offered in 1/4 in FNPT with a 125 psi maximum pressure and 180 °F temperature limit; choose it when those figures match your system requirements.

What does the 125 psi rating mean when the breaker is installed on a supply line?

It indicates the maximum continuous working pressure the device can withstand while preventing back-siphonage per ASSE 1001 and CSA B64.1.1 standards.

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