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Lead Free* Trap Primers

The Series LFTP300 operates by sensing the pressure drop in the supply line from downstream fixtures or appliances. The pressure reduction above the valve disc causes the disk to move upward, opening the lower disc seal and closing off the upper disc seal. With the lower disc seal open, the stored air pressure in the air chamber pushes a portion of the contained volume of water from the lower chamber out through the opening beneath the lower disc seal to prime the trap. When there is no longer a demand in the supply line and the full line pressure is restored, the valve disc lowers – opening the upper disc seal, allowing flow through the one way seal, seating the lower disc seal, and recharging the air chamber for the next pressure drop cycle. The Series LFTP300 incorporates a built-in vacuum breaker which does not satisfy compliance to ASME A112.1.2. The Series LFTP300 features Lead Free* construction to comply with Lead Free* installation requirements.


  • Prevents floor drain traps from losing their water seal by evaporation, which helps prevent backflow of sewer gas
  • Built-in vacuum breaker 
  • Lead free*
  • Threaded or solder inlet connection

Select a Model

Select options below to identify the UPC, Order Code, and Repair Kit for a specific LFTP300

Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: