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Small brass vacuum breaker with NPT threads and silicone seal

Watts

Watts LF288AC Anti-Siphon Vacuum Breaker 3/8 in Silicone Seal

SKU CH-1RQD-YGWXV

Prevents back-siphonage in plumbing systems with a lead-free brass body, silicone seal and 125 psi rating

  • TypePipes, Valves & Fittings
  • Prevents backflow contamination with ANSI A 112.1.1 certified anti-siphon design
  • Lead-free brass construction meets NSF/ANSI 372 drinking-water safety standards
  • Silicone seal operates reliably from 33 to 180 degrees Fahrenheit
  • Withstands 125 psi maximum pressure for durable residential service
  • Compact 2 1/4 inch height fits tight plumbing installations

Anti-Siphon Protection for 3/8 in Connections

The Watts LF288AC vacuum breaker installs on a 3/8 in NPT line to prevent back-siphonage of contaminated water into the potable supply. Its lead-free brass body and silicone disc float seal meet ANSI A 112.1.1, ASSE 1001 and NSF/ANSI 372 requirements. The device suits residential and light-commercial fixtures where a compact, code-listed backflow preventer is required. It is not intended for continuous-pressure applications or for lines larger than 3/8 in.

Thermals, Noise and Power Draw

The brass construction handles a working pressure up to 125 psi and a temperature range of 33 to 180 degrees F without external power or moving parts that generate noise. The silicone seal remains flexible across this range, maintaining a reliable seat during pressure fluctuations. No electrical connection is needed, so the unit adds zero energy cost and produces no audible operation under normal flow conditions.

Build Quality and Daily Implications

Lead-free brass and a silicone disc float provide corrosion resistance and long-term sealing in potable-water systems. The 2 1/4 in height and 1 3/4 in width allow installation in tight cavities behind fixtures or inside cabinets. NPT threads enable direct connection to standard 3/8 in piping without adapters. Compliance with cCSAus B 64.1.1 and UPC listing simplifies inspection approvals. The unit cannot be used where a testable assembly or higher flow capacity is mandated.

Highlights

  • Prevents backflow contamination with ANSI A 112.1.1 certified anti-siphon design
  • Lead-free brass construction meets NSF/ANSI 372 drinking-water safety standards
  • Silicone seal operates reliably from 33 to 180 degrees Fahrenheit
  • Withstands 125 psi maximum pressure for durable residential service
  • Compact 2 1/4 inch height fits tight plumbing installations

Specifications

BrandWATTS
TypePipes, Valves & Fittings

Questions about this item

How do I install the Watts LF288AC vacuum breaker on a 3/8 in NPT connection without cross-threading?

Thread the breaker by hand onto the 3/8 in NPT fitting until the silicone seal seats, then tighten one-half turn with a wrench; over-tightening distorts the seal and causes leaks.

When should the silicone seal be inspected or replaced on the LF288AC?

Check the silicone seal annually or whenever the breaker is removed; replace it if it shows cracking, hardening, or permanent deformation to maintain the anti-siphon function.

At what pressure does the LF288AC relief disc begin to open during sustained flow?

The disc float opens when system pressure reaches the rated maximum of 125 psi, venting air to prevent back-siphonage.

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