The inner diameter of thermowell is for 1/4″ outer diameter stem thermometers.
Thermowell Size: ID – 7.5 mm; OD – 9.5 mm
Requires a 7/8″ drill bit to install. To prevent leaking, wrap the 1/2″ threads with Teflon tape prior to installing the hole.
The Kit Include: Thermowell, Stainless Washer, 1/2″ NPT Lock Nut, Two Silicone O-rings