Mineral Insulated Thermocouples Mineral Insulated Thermocouples T – 103 Thermocouple with Head & Tip Assembly T – 104 Thermocouple with Head and Weld Pad T – 105 Thermocouple with Nipple T – 106 Thermocouple with Nipple Union Nipple T – 274 with Junction Box & Adjustable Compensation Fitting with Stub T – 344 Thermocouple Inset with Fitting