60cm Thermowell - bulkhead includedPerfect for use with the Fermzilla but will fit almost any fermenter that has a flat surface at the top to mount the bulkhead fitting. Easy to use Made from 304 stainless steel 8mm (5 16") OD x 7mm ID. This thermowell fits into any 8mm Hole and can literally be installed into almost any fermenter lid. Having the thermowell attach to the lid of a fermenter is ideal as it means the penetration through the fermenter body is at the top of the fermenter