I don't think it's good practice to have the PRV as your only release, I use the spunding valve and have the prv as backup.
Blowoff tube if the krausen likely to exit via the spunding valve or link in a blowoff capture before the spunding valve.
However if your pressure high enough you can control the krausen but only if you can see it to do that, however high pressure has
other potential detriments.
I did stand this up after the video, useful way to do a sterile top crop without opening.
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