How can you tell the difference on the older/newer 6025-nano's

[epleeds]

I have two 6025 nano's and the propeller is different. One is all white including the center piece and the other is a white propeller with a black centerpiece. Roger, can you tell me which one is the newer one. and if there is anything that makes one better over the other.

thanks...

 

[rvitko]

The black drive unit is the newer one, the plastic is graphite reinforced and lasts longer and runs with a lower pitch noise that is less audible. Assuming the pump came with the black drive unit it would have all the other changes like titanium alloy shaft, greater reinforcement of the shaft attachment, stronger fitting cover, heavier gauge cord. The other pump could have some or all of these changes as well but it is slightly older.