I have seen all sorts of approaches for dry hopping without O2 pickup and, while ingenious, there are issues with each approach IMO.
I’ve resolved myself to the best I can do is get the beer cold to slow the O2 uptake, flush with CO2 while the container is open, add the hops, close the container, and thoroughly purge the headspace. I am aware that I very well may be sacrificing all the advantages of closed transfer doing this.
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