The APW 1473400 thermopile generates a small electrical output from heat, supplying millivoltage to compatible gas equipment control circuits. Its 24-inch lead length and two-lead configuration identify the connection arrangement for the designated assembly. This component is used in commercial foodservice equipment where thermopile output supports pilot-operated gas controls. https://partsfe.com/1473400-apw-thermopile-24-2-lead-thermopile/1-1473400.html1473400