York 026-32328-000 WELL THERMO

026-32328-000 is the original factory part number of York (YORK / Johnson Controls), corresponding to the part as "thermometer sleeve", which is called "Thermo Well / Thermowell" (as you wrote WELL THERMO, this is the same item), and is used for temperature measurement positions in York chiller units (such as YK series).
Structure and specifications: made of brass, a closed-ended tubular connector, approximately 6 inches long, 1 inch wide and 1 inch high, weighing about 0.23 pounds (104g), with a temperature resistance range of approximately −100°F to 400°F. Installation forms commonly include threads, socket welding, welding or flanges.
Function: It is installed on pipes, water chambers or evaporators/condensers shells. The temperature sensor (probe) is inserted into the sleeve without directly contacting the fluid. This not only isolates the probe from the measured water, refrigerant or gas, avoiding medium erosion, corrosion and direct high-pressure impact on the sensor, thereby extending the lifespan of the probe; but also brings a key convenience - during maintenance or replacement of the sensor, there is no need to stop the machine, empty the water or release the pressure, simply pull the probe out of the sleeve.