The Robertshaw 1950-001 36" Thermopile with PG9 Pilot Adaptor and 2 Leads is a reliable power-generating device used in gas furnaces, heaters, and water heaters. It converts heat from the pilot flame into electrical energy to operate gas valves and ensure consistent ignition. https://www.partshnc.com/1950-001-robertshaw-thermopile2-lead36-wpg9adap