Thanks for the update. Those pumps appear to have a 3-year warranty, in the event you'd like to continue this test.
Looking over their website, I wondered if there could be any difference in the expected durability between the "Aerator pumps" and the "Bilge pumps". Then I found the tables with the replacement motor cartridge listings. I see they use the same cartridge, so I guess the answer to my question is "No".
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