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Old 08-09-2012, 06:30 PM   #1
Jun 2010
Posts: 636
Liked 39 Times on 34 Posts

I got a 200L variable capacity fermenter and it comes with a dry airlock.


It uses marbles to allow air to blow by and then fall back in place, sealing the hole. I get that part. Why does it have TWO marbles such that it allows air to go INTO the fermenter? There's one up top that allows air to go up and around the sides of the airlock into the fermenter. What am I missing here?

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Old 08-09-2012, 06:45 PM   #2
malkore's Avatar
Jun 2007
Posts: 6,922
Liked 37 Times on 35 Posts

To avoid a potential vacuum from forming. I toured a very small distillery once and their mash tun had a faulty valve which didn't allow air inside as it cooled. The result was a 15BBL mash tun implosion. Luckily the manufacturing defect was under warranty so they got a brand new mash tun.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10

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