S-shaped vs 3-piece airlock

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Others mentioned the big benefit of the three piece is that you can easily connect a blowoff tube. The downside is that they tend to have way more suckback than the S airlock and evaporate quicker.

I tend to use the three piece airlocks I have on some of my smaller fermenters for primary because there's less headspace and more chance I need a blowoff. S airlocks for everything else. Anything aging for a while has an S airlock to avoid problems with suckback and evaporation.
 
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