Outdoor Faucet Freeze Protector - Protects faucets, hoses up to 150 ft. animal waterers, water wells, Rvs, backflow valves, etc. in the most extreme freezing conditions. Uses No Batteries or Electrcity. Activates when water temperature falls below 37 deg. F and starts to release the exact amount of water to keep it at 37 deg. F. Self regulating. No more insulating pipes or draining hoses. | Freeze Miser Faucet Freeze Protector