The first pump I used was one just like NeoMoses used. I ran it for a little while, and had problems with the anodizing that I assumed was from the grease. So I cleaned it all out, and it ate itself up shortly after that.
Then I bought a Little Giant Pump similar to the one Fibergeek mentioned. I cleaned the grease out of it before the first use and it has run hundreds of hour so far. I haven't inspected it for a while, but last time I did it looked good and didn't appear to be wearing excessively.
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