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> I have only had one problem of note with this approach: Stretching airline
> tubing over the copper tubing can be difficult, since the tubing I used was
> slightly larger than comfortable for the (silicone) airline tubing I had. I
> think the nominal OD of the copper tubing I used was .25 inch. This makes a
> snug fit. The overall effect is similar to a predrilled stopper and glass
> lab tubing; it's not nearly as easy to clean, but that's not so important
> for our application.
I don't use the yeast method myself (except when I homebrew ;)), but it
seems to me that rigid airline tubing might be a better choice than
copper both from a toxicity point of view and usage point of view.