Too bad they don't include them by default with their filters. I bought this because I was tired of lifting the top tank to see how much filtered water I had in the bottom tank. It's still a bit of guesswork on how much water to add to the top tank to keep the bottom tank full enough, but it's a lot easier now. Other advantages are that this nozzle has a higher flow rate and protrudes a little further from the tank for easier access.
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