Pumps are rated by the flow directly out of the nozzle. So 500GPH is what it pumps with nothing attached. And it has everything to do with height. You loose about 100GPH with each foot of head. Give or take, I don't really remember. Each 90 elbow equals about a foot of head too. You are better to go to a wider tube. If height did not matter then we would not even need pumps would we.
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