From the HBD Archive
From: smithey@rmtc.Central.Sun.COM (Brian Smithey)
Subject: fermenters and seals
Date: 1992-04-16 14:51:33 GMT

In HBD #865,
>>>>> cjh@diaspar.HQ.Ileaf.COM (Chip Hitchcock) writes:

Chip> I also wouldn't automatically endorse the sealing properties of
Chip> carboys. I have several 3-gallon carboys (I've been doing
Chip> tweaking on half batches) with the standard orange soft-plastic
Chip> caps and have found most cap/carboy combinations don't seal
Chip> tightly enough to force exhaust CO2 through the fermentation
Chip> lock; I've used various gimmicks, including props, string around
Chip> the outside, and plastic washers (made from the seals on
Chip> 5-gallon water jugs) inside to make a tighter seal, but haven't
Chip> figured out whether I've run into a bad line of caps or the neck
Chip> of the 3-gallon carboy is just a hair smaller/shorter.

I have a 25 liter acid carboy which I have fitted with one of
the orange carboy caps that Chip refers to, as well as 5 gallon
and 3 gallon carboys that take a drilled rubber "cork" (#7 I think).
I've noticed that with the orange cap, I get a good seal probably
about 1/2 the time; on the occasions when it doesn't seal I don't see
any bubbling out of the airlock. I do primary fermentation in the
big carboy, so I don't worry too much about the imperfect seal,
but on the smaller carboys (my secondary fermenters) I always get
a good bubbling seal with the rubber stoppers. Chip, you might
want to find drilled rubber stoppers for your 3 gallon carboys.
My small carboy was made in Italy, and imported by Crosby & Baker;
if yours is similar, it probably takes a #7.

- --
Brian Smithey / Sun Microsystems / Colorado Springs, CO

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