This beta module serves multiple purposes.
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If you’re using your base as a hookah, you can put some water in the base and then screw in the omnistem to create downflow percolation.
If you’re using a non-perc base, you can fill the base will a little water, screw in the omnistem and then water will flow up the omnistem creating massive percolation in the above chamber.
You can use the omnistem along with a downflow percolator to create a percolation chamber whenever is smoke is flowing downward (in the direction of gravity).
This is a beta module, though it may be cosmetically flawed it will be fully functional.