The ICM103 is the legacy part number

It is not a universal thermocouple

it enables versatile circuit logic—common for fan speed changeover or triggering an auxiliary alarm during a high-heat event

As a veteran-preferred 2-1/2 inch replacement gauge

Heil Quaker ICP 1178474 Conversion Kit The ICM103 is the legacyProfessional contractors know that fuel conversion is a precision task requiring exact hardware. The Heil Quaker ICP 1178474 Conversion Kit is a field ready solution designed for LP to Natural Gas conversion. This genuine OEM replacement part provides the necessary components to transition propane fired heating appliances back to natural gas operation, ensuring the burner manifold and gas valve operate within the specific 3. 5" WC manifold pressure