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Weak air pump fix?


I have a four outlet Top Fin Air-8000 that's running pretty weak.

I'd like to try to fix it before spending money on a replacement pump.

I've watched several videos and tried replacing the rubber gaskets with a Ziploc bag flap and it didn't do anything. The rubber cap/cushions aren't messed up either. And the air filter isn't clogged.

I don't see anything wrong inside. But maybe someone can suggest something?