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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
The spot where you have the arrow is 1/2"-14 NPT. My kegger doesn't have the one you circled. WK had a good idea for comparing it to the heater outlet. That is 3/8"-18 NPT.
Thanks for the additional ideas folks. I thought those ports may have been a metric thread, but wasn't sure. I'll test fit some 1/2"x14 NPT and 3/8"x18 NPT plugs and see if they work.