The 1/4\" ZWFR Freeze Relief Valve prevents damage from sudden or unexpected freezes on all major brands of Backflow Preventers and Pressure Vacuum Breakers installed above ground. Its durable， compact design requires no periodic maintenance and allows for easy， hassle-free installation. The Model ZWFR automatically opens at 35°F to discharge near freezing water from the backflow device， drawing warmer supply water through the valve until closing when the temperature reaches 40°F.

Compact， thoughtful design eliminates periodic maintenance and eases installation

Suitable for wide range of applications in areas where unexpected freezes occur

Automatically opens at 35°F and closes at 40°F

300 series stainless steel springs

Cast bronze body resist corrosion

IAPMO LISTED - IGC 163-2001r1

Easy to install

One year warranty

Install on the downstream test cock or attached piping of any backflow device

Best installed in the vertical down position， though horizontal orientation is possibl