I am looking to use a 1/2'' NPT x 1/4" compression fitting to put a digital temperature probe in the way of the wort as it goes through a two stage counterflow chiller that I built. I don't want to use the double ferrule that comes with the fitting, but I am having a hard time finding the dash number for the o-ring size. brewers hardware sells the o-ring, but they give no specifications, and I assume it would be in poor taste to ask them, just to purchase them somewhere else.
Any ideas on the dash number? Here is a link to the o-ring I would like to get: https://www.brewersh...ng-for-1-4.html
At least, I believe the is the o-ring I would need. I put a micrometer to the temperature probe and measured .15 inches. I need an o-ring that can seal that against the fitting (I just ordered the fitting online, so I don't know what the OD of the O-ring should be).