Show or Hide


FR 500

Thermostatic Freeze Relief Kits


1/8 to 3/4 in. (3 to 20mm)


Series FR 500 Thermostatic Freeze Relief Kits are designed to keep water from freezing in the backflow preventer, while avoiding discharges based on the air temperature dropping below freezing. Series FR 500 thermostatically measures the water temperature and opens at 35°F (1.6°C) and closes at 40°F (4.4°C). Maximum Working Pressure: 175psi (12.06 bar).

Loading Models/UPC Codes...
Loading Models...

To preview and download CAD Drawings for this product, please select a model/size from the list.

Loading Approvals...
Loading warranty information...
Loading data...

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.

Please Note: Watts literature requires Adobe Acrobat Reader to view.

Learn About

USC Cross-Connections in Household Plumbing Systems Study

There are a number of potential cross-connections in household plumbing systems that must be protected against backflow. To learn more about these hazards and to download a recent study from USC on cross-connections in household plumbing systems,

For more info, click here.

Featured Item

Backflow Prevention Assembly Tester & Training School Directory

Offering the largest online directory of Backflow Prevention Assembly Testers & Training Schools in Canada. This free service gives you exposure and presence in the backflow community.

For more info, click here