Opinions on Vented Carboy Hoods

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Where do you get them? What happens when the carboy experiences negative pressure?
My LHBS sells 'em, although they are not listed on his site. A site that lists the one I use is here, but I've not done business with them.

Nothing happens if there is negative pressure. The bung may be harder to get out, but certainly not as hard as a barrel bung after 6 weeks.
 

NorCal

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I’ve been using that style for 9 years. I like them for those carboys where the regular style bung isn’t a real tight fit; not all bung holes are the same. You can see some in use in the background during a barrel racking.
8E902BDA-1F6E-4DE3-900E-97E2EFDEF44E.jpeg
 

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