Cleveland 20410 36" Thermopile 2 Lead 250–750 mV is a dependable sensing component that generates operating power for gas-fired equipment without requiring an external electrical source. It converts heat from a pilot flame into electrical energy through dissimilar metal junctions, producing a stable millivolt output. The thermopile functions by continuously sensing flame heat and tran... https://partsfe.com/thermopile-for-cleveland-part-20410