Need to find a thermocouple. I see these "screw on" probe types with 6.3mm thread for sale on certain online auction websites which are very cheap. Do these fit easily to replace one of the boiler screw? Or alternatively what about these other ones with black tips which sell for under $10 bucks?
If not any recommendations of local places I can source a decent thermocouple which mounts easily to the boiler? Also what length cable do you recommend?
If not any recommendations of local places I can source a decent thermocouple which mounts easily to the boiler? Also what length cable do you recommend?

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