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LF4L Watts

Lead Free* Poppet Type Pressure Relief Valves for Protection Against Excessive Pressure

Series LF4L Poppet Type Pressure Relief Valves are used to protect against excessive pressure in tankless water heaters. Similar in construction to Watts Model LF3L, the LF4L has no temperature relieving element. Series LF4L is available in 150 psi (10.3 bar) standard setting. The LF4L features Lead Free* construction to comply with Lead Free* installation requirements.


  • Stain steel spring and silicone disc
  • Forged Lead Free* copper alloy
  • Furnished with test lever
  • Poppet style pressure relief valve protects tankless water heaters from excessive pressure

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LF4L