The Probe Ports I used are the Halex 1" Water-tight Entrance Connector. I wanted a larger opening to accommodate any size probes. There are 3/4" available if the 1" is larger than you need. To keep the port from leaking smoke or screw with your drafting I used heavy duty foil on over the inner ring opening. When you want to use the port, just poke your prob(s) through the foil and go. After each cook I just replace the small piece of foil on the inside and screw them back on.
Lotta good ideas out there. I used a short threaded pipe nipple. It is large enough to put my probe thru and I can screw a pipe cap on it when not in use.
The foil is a super easy and quick way to plug up leaks around the wire. Another trick is to drill out a plug with a hole saw on a piece of lumber. Then make a cut from the outside edge to the center hole. It will allow you to slide the wire into the center of the plug and the slot will allow it to spring a little and hole it in place. You could also use a cork and just cut a small notch out of it.
Got my second smoke in last weekend. Spatchcocked 4 large chickens, sausage and tried a small roast. All went well except the seasoning of the cooker. Whoever said use a small amount of cooking spray to season the cooker was right. Although seasoned on 7/3 the large can of Pam I used is still dripping from everything... lesson learned!
I think most of us made the same mistake. It doesn't seem like a lot when you are putting it on but it looks like a lot when it's dripping from everywhere.