The Lochinvar & A.O. Smith 100113125 Natural Pilot/Thermopile W/Tubing is a replacement ignition and flame-sensing assembly designed for compatible natural gas water heaters. The pilot produces a controlled flame for burner ignition, while the thermopile converts heat from the pilot flame into electrical energy to support gas valve operation and flame safety. The included tubing provi... https://www.partshnc.com/100113125-lochinvar-ao-smith-nat-pilotthermopile-w-tubing