15" Stainless steel thermowell compatible with the Ranco ETC temperature controls, Johnson A419 controls and other controls with a 1/4" diameter temperature probe.  Allows for the safe insertion of these probes in liquids without risking damage to the sensor and possible inaccurate readings. 

This thermowell is ideal for use in brewing to control fermentation temperatures, aquariums, sous vide cooking and dozens of other applications where a more expensive machined and threaded stainless thermal well is not required.

The #7 stopper will fit 5, 6 or 6.5 gallon carboys or similarly sized opening.  Can be used with or without the stopper.