I use an orange carboy cap with vinyl tubing over one of the outlets. Thus far no blow-off, but I'm good to go if a wild fermentation ever occurs.
Some people say the orange carboy caps don't seal well on BB's, but they seem to on mine.
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Cheers,
BP
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Fermenter 1: Best bitter (1)
Fermenter 2: Best bitter (2)
Fermenter 3: APA
Fermenter 4: APA
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