I had ordered this Blichmann Brewmometer beforehand thinking I was going to get a Polarware kettle with a threaded insert BUT then I got a Keg instead and tried to make this work.
I can't get a good seal because the hole was drilled slightly too big I think and now I'm trying to get washers and o-rings to fill the gap.
My question is these threads are 1/2" NPT. I'm tightening this into a copper 1/2" coupler inside. On McMaster Carr they have stainless steel (18-8 or 316) with washer sizes like .5,.501,.503,.515,.531, etc.
What would you guys say would be a tight fit but fit over the threads. I will use a washer or two on the outside and inside plus some o-rings around 11/32size to hopefully seal this up for good.
Thinking bout these O-Rings:
Here is the temp probe I have.
As always I appreciate the help!