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Lead wire for Type K thermocouple. Wire includes female tabs for attaching to the terminal strip and the ends are pre-stripped to insert into the terminal block.

Do I need to replace the porcelain block and wire if I replace the thermocouple?

No. As long as the wire and block are not damaged or corroded you will not need to replace them.

Which wire is positive and which is negative?

On a thermocouple, the red wire is negative and the yellow wire is positive.

8 Gauge Thermocouple Replacemet - Standard Thermocouple

How to change your old M1 Sheath Type Thermocouple with a new style 8 Gauge Thermocouple