This is something i did earlier this year for my therm probes so i thought i'd share it as a cheap to other conduits.
This worked really well...no worries about crimped probe wires, easy access for multiple probes all in 1 eyelet and it seals snugly.
I bought a 1/2 inch conduit nipple, 1/2 conduit nut, and a sealing cork 3/4 x 37/64 at Lowes. (2 pack)
This will work on any pretty much any smoker but needed something for the UDS. I drilled a 3/4 hole with a step bit and just widened it out a tad...the nipple fit right in. Total cost- $3