I know some folks use thermowells and some don't, however I like using them and recently bought a 15 gallonish Speidel plastic fermenter after realizing that if I blew hundreds on the stainless conical my wife was probably going to cause me to have an "accident". So, being tired of splitting batches, I bought this and wanted a thermowell. The longest I could find was the 12" from Brewers Hardware which I would have use except they are backordered. I was able to find this at Automation Direct for $28 plus shipping. It's stainless and 560 mm long (about 22"). This and a 1/2" SS nut and gasket from Bobby at Brewhardware and it's ready to go. I wanted to post in case another Speidel owner wanted to install a well into theirs.