The Hobart 722158 thermopile supports reliable pilot-flame safety and gas-valve operation in compatible commercial gas equipment. Positioned in the pilot flame, it converts heat into a 250–750 millivolt electrical signal and sends that power through its two 36-inch leads to the associated millivolt gas-control circuit. When the pilot remains lit, the signal helps keep the safety valve... https://partsfe.ca/722158-hobart-thermopile