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I've been using them for quite a while. Young's might of rebadged them, but they did not design them.Apart from being big they are 3-piece, which is really quite handy. The central bit floats so the bubbles come out at about the same depth however full the lock is -- seems to prevent vigorous fermentations blasting out the airlock contents. Sort of seals (not perfectly) if the liquid gets low or is being sucked backwards.
I've been using them for quite a while. Young's might of rebadged them, but they did not design them.
Apart from being big they are 3-piece, which is really quite handy. The central bit floats so the bubbles come out at about the same depth however full the lock is -- seems to prevent vigorous fermentations blasting out the airlock contents. Sort of seals (not perfectly) if the liquid gets low or is being sucked backwards.