GKTech makes ones that fit and actually seal with the rubber o ring. Years ago (like 10 lol) there was a writeup on here but the actual fittings that you put into the rack were not the right length so despite it having o rings, there wasn't anything available that was long enough to actually seal. I used a copper crush washer and tighten it down a ton and never had leaks, but a few years ago actually swapped over to the GKTech ones, and no issues either, and price is very reasonable.
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