20" fully polished 3/8" thermowell welded into a 1"/1.5" Tri Clover Compatible Cap with 1/2" FPT inlet. 20" is the penetration past the face of the tri clover compatible flange.
1/2" FPT inlet is often used to secure a thermometer or cable strain relief. 1/4" x 1/2" MPT fitting makes a great strain relief/ cord grip