Easy to Install. Upgrade your Automatic Hand-Free Faucet with our Temperature Mixing Valve will allow you to adjust the water temperature. Most sensor faucet does not include a mixing valve so you only get a single water supply to allow either cold or hot water. But with our Temperature Mixing Valve, you can connect both of the water hose into the valve for temperature control. Simply switch the knob to Cold, Open, Hot or Off for the perfect temperature. (Note: The valve does not set the exact temperature of the output. The temperature will be depended on the hot & cold water input and the setting of control.)