This airlock made from polypropylene is much less rigid and less likely to crack compared to standard three-piece airlocks. Toss it into a bucket of sanitizer with your other equipment and don’t worry about it breaking.
For both carboys and buckets. In our opinion 3-piece airlocks are superior to the triple ripple type in that they can be taken apart and cleaned. However, we do sell the triple ripple or S-shaped type in case you are used to that type and would like to stay with it.