Will this fit a 5 gallon carboy?

Thanks. You will use a #6.5 or #7 stopper for most 5 gallon glass carboys. You will need a #10 stopper for 5 gallon plastic carboys.

What size in millimeters does the stopper have?

Thanks for asking. The stopper has a 26mm bottom diameter and a 31mm top diameter.

How do you know it’s done it’s job?

When the inside portion stops moving,I personally prefer the s-types

Will this airlock work with a 2 gallon mr beer lbk?

Measure the opening on your container and see if anywhere near the size of the opening on a one gallon jug, to make a seal, and it should work great.

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