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Watts LFN9-1/4 dual check valve, lead-free brass, 1/4 inch FNPT connections

Watts

Watts LFN9-1/4 Dual Check Atmospheric Vent 1/4 in FNPT 180°F CSA B6437

SKU CH-5PA4-FM7S7

Dual check valve with atmospheric vent rated to 180°F and CSA B6437 certified

  • TypeTraffic & Parking Lot
  • Lead-free brass body prevents contamination
  • Atmospheric vent stops back-siphonage
  • Dual check valves block reverse flow
  • Rated for 180°F hot water service
  • Certified to CSA B6437 standard

Watts LFN9-1/4 Dual Check Vent

The Watts LFN9-1/4 is a lead-free brass backflow preventer designed for plumbing systems requiring atmospheric vent protection. It serves residential and commercial installations where cross-connection control is mandated by code. The dual-check mechanism provides continuous protection against backpressure and backsiphonage. This valve fits standard 1/4 inch FNPT connections on both inlet and outlet.

180°F temperature rating and CSA B6437

The valve operates at a maximum temperature of 180 degrees Fahrenheit, suitable for hot water supply lines within that limit. It meets the CSA B6437 standard for dual-check valves with atmospheric vent. The automatic re-seating function is not included, meaning manual intervention may be required after a discharge event. Performance headroom ends at the rated temperature and pressure limits of the standard.

Lead-free brass body with 1/4 inch FNPT ends

The body is constructed from lead-free brass for corrosion resistance and potable water compliance. Inlet and outlet ports use 1/4 inch FNPT threads for direct piping without adapters. The compact body measures 2 3/8 inches in height and 1 1/4 inches in width, allowing installation in tight spaces. The atmospheric vent port provides a visible discharge point during backflow events.

Highlights

  • Lead-free brass body prevents contamination
  • Atmospheric vent stops back-siphonage
  • Dual check valves block reverse flow
  • Rated for 180°F hot water service
  • Certified to CSA B6437 standard

Specifications

BrandWATTS
TypeTraffic & Parking Lot

Questions about this item

Will the 1/4 in FNPT connections on this dual check valve mate with my existing 1/4 in FNPT plumbing fittings?

Yes, both inlet and outlet use 1/4 in FNPT threads, so the valve threads directly onto matching fittings without adapters.

How can I confirm the atmospheric vent is functioning after installation?

During a backflow event, water should discharge from the vent port, showing the check valves have closed and the vent is relieving pressure.

Does the box include any pipe tape, fittings or tools, or must I supply them?

Only the dual check valve body is supplied; thread sealant, wrenches and any piping must be provided separately.

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