I bought these pumps to circulate water in a lizard terrarium. Several of them went out of service in about a couple of weeks. So I took one apart and that pump is just a DC motor in a plastic case. It is NOT waterproof and does NOT contain any corrosion resistant materials. Therefore, it will rust and stop working after 7 days. They get 2 stars because they move a decent amount of water with no pressure and are pretty cheap if you need something you're just going to throw away.
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