Faucet protection in just 2 SIMPLE STEPS: Hand-tighten the Freeze Miser on your exterior faucet. Open faucet all the way to ensure that water pressure is available to the Freeze Miser (Minimum 10 PSI). And that’s it – YOUR FAUCET IS PROTECTED FROM FREEZING! The Freeze Miser® operates like the thermostat in your home. After installation, it senses the internal water temperature arriving at the faucet, not the air temperature. The Freeze Miser® activates when the water temperature drops below 37º F/3º C. No water is released until the activation temperature is sensed. The Freeze Miser® is on guard 24/7!