Product Features All brass construction Safety flame sensing generator For use with f273116 safety valve 30 millivolt output 12-1/2" REPLACEMENT THERMOCOUPLE FOR MOST MR HEATER TANK TOP MODELS Replaces Mr Heater part number F273117 Make sure to check parts manual for your specific heater. There are many similar thermocouples Brand names are used for reference only. These are not original manufacturers parts.