This thermowell fits into any 8mm hole and can literally be installed into almost any fermenter lid. That suits the RAPT Temperature Controller or MKII Temperature Controller as well as any pocket thermometer.
Specifications:
600mm Long x 8mm OD x 7mm ID Thermowell
Overall length of Gen 3 duotight fitting = 38mm. Gen2 = 35mm
Nut thickness 6-7mm
Includes:
Gen3 - 8mm (5/16") duotight x 1/4" BSP Male thread with O-Ring and Lock Nut