Valves serve an important function in your gas fireplace, stove, or log set. The valve allows gas to flow to the pilot light and burners. If the thermocouple detects that the pilot light has gone out, the valve will cut off gas flow as a safety precaution. A properly functioning valve is crucial to the safe operation of your gas fireplace or log set. Stove Parts for Less carries valves for a variety of gas fireplaces, for top brands such as Heatilator, Heat & Glo, Lennox, and more.