I have the old style brick (got it 1 month before the new cores..) I use a swivel 1/2" npt to 12an 90 degree fitting on that side. I got another one for the other side, but that one is not leaking (fixed 90 degree 1/2" npt to 3/4" barb). I had to cut the fitting off the side I installed the swivel on (installed it a while back), only way to do it without cracking open the AC lines since the fixed 90 degree fitting will hit the AC lines on the chiller if you try to unscrew it. Newer cores don't have this issue, since they have a male 12an bung built into the core instead of the 1/2" NPT female bung. When I cut the fitting off I used a dremel and dremel metal cutoff wheel. If you have the old core and want to switch it's possible (if you used fixed metal 90 degree fittings) just wear goggles and a mask, run a vacuum to capture the aluminum dust while cutting it. Take breaks and let the aluminum cool down, that temp goes from the fitting to the core. If you used the plastic fittings they'll be a lot easier to cut off for the swap. they do hang down a bit lower so just be aware
