That does the job well. Some people find it doesn't fit with an air pump or foam filter/air stone. It fits, you only need to take a few minutes to put it on. not only does it slip on quickly, and there's a reason for that. If applied quickly, it will not be as reliable and tight as it should be. Be patient when placing it on the air pump/air stone/sponge filter. I promise you it fits.
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