The pass though is for electric wires. You can find them at any HD or Lowes in the electrical section. They have a nice rubber center and I use them on all my smokers. Just use a step bit to drill the hole and you’re good to go, 3/4" I believe. Cost like 2 bucks.
Web Flamed UDS ,
Bar B Chef offset modded, 22.5" Weber w/ Rotisserie
SJG Baby Bullet
, Medium BGE
, 84' Broilmaster restored, Super Fast RED
A Wife who runs a Butcher Block