Air Tight Thermocouple Jacks/Plugs

[fifty60]

I have used these Omega thermocouple jacks and plugs in the past. I am looking for something similar now, but they will need to be as close to air tight as possible. With these connectors, whenever there is a positive or negative pressure the air seeps in and out easily..

 

[Aleman]

Have worked with a lot of thermocouples over the years. Can't recall seeing a jack that was different than your pic.

But Omega does sell M12 connectors loaded with thermocouple pins. Not cheap about $50-60ea. But if you used those for inline connections then you
can just run into your box with cord grips that will seal around the wire. In other words ditch your existing jacks and replace with inline connectors.
Just a thought.