Weldless Thermowell from Ss Brewing Technologies. The universal design allows for easy installation on most vessels (including Speidel!). A must have upgrade for your existing Brew Bucket. It is constructed from 304 stainless steel, and approximately. 6 inches in overall length, with the inner thermowell portion being almost 4 of those inches.  The thermowell fits into a 17mm punched/drilled hole.