Spike's thermowell features a 1.5" TC on one end and a 1/2" NPT on the other. This allows it to attach directly to the TC fitting on a kettle. The NPT port on the outside allows for the thermometer to be screwed in. It also allows for an optional digital temp sensor to be attached.
Pro Tip:
The thermowell can be packed with thermal grease to help temperature response times.
Specs:
-1.5" TC x 1/2" NPT
-304SS
-4†long
-.250" ID