Resideo Q340A1090/U Thermocouple
The Q340A thermocouples sense the pilot flame on standing pilot gas-fired heating systems. The pilot flame heats the tip of the thermocouple, producing a temperature differential between it and the base to generate 30 millivolts.
Resideo Thermocouple, Male Connector Nut Connection, 30 mV, 0.02 ohm, Natural/LP Gas, 36 in L Lead, Import