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Generally this will be a bushing that is not seated in the pump sockets, they should not be loose or come out but firmly seated down in the socket in the motor and impeller cover, they do sometimes come loose in shipping. If that is not it, another possibility would be not seated deeply enough or a wrong intake housing, the DC model has a slight change to the intake and if the factory mistakenly fitted an AC housing it will get too much air and cavitate.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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