The ExactTemp® consists of a minimum of two valves, one thermostatic and one volume control valve. The thermostatic valve will only adjust the temperature of the water, and the volume control will turn the unit on and off and adjust the volume of water. The thermostatic valve has a safety stop preset at 105 degrees Fahrenheit. The temperature override button will allow the user to exceed this temperature and reach temperatures of up to 120 degrees Fahrenheit. In addition to being vertical spa compatible, it also provides Thermostatic Control, Temperature Consistency, and Temperature Memory. For more information, please view our product literature in our Literature Center.