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Water Safety & Flow Control


Lead Free* Trap Primers

Lead Free* Models Available


1/2 in. (15mm)


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.

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Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

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