I have a basic 50L keg with a 2" column, no reflux yet. I've been looking at plates and plate sections compatible with 2".
Info and videos on bigger diameter ones is plenty, where you have a couple downcomers through which liquid can flow back down the column and some going up for vapours to flow, but the small 2" ones are rarely shown or explained; the problemis they all come with just the one bubble-cap and there's a lot of plate variations, , some 1 big hole, and some with.
I get how the no holes one works and the one with small ones might be just enough so that surface tension holds some of the liquid up. I was planing on getting , cause the brand is usually recomended here and ease of access. However, I can't find an explanation that will tell me if the 1 or 2 big holes the plate has will be compatible with a no reflux still or I would just be adding some copper in the path and no liquid will be trapped (essentially a waste of money).