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As an option available for eye-face washes (or eye washes), the 1/2 inch Freeze Protection Valve will initiate flow when the thermostatic actuator senses a temperature of 35°F (1.7°C). It is typically piped to a drain and thereby purges the cold water and brings fresh water to the valve/fixture to prevent freezing conditions. The valve will remain open until it senses a water temperature of 40°F (4.4°C) or more at which point it will automatically close (resetting itself).