My Eheim Pro II started making annoying noises and the flow seemed to drop, so I took it apart and found the impeller shaft was broken (after 20 years, probably normal fatigue). So I ordered this part, thinking it would be an easy replacement, but found that the new part was about 1/4 inch longer (the bearing housing door wouldn't snap to the underside of the powerhead. So I grabbed a Dremel cutting disk, excess length removed, bearing cap put on and "Shazam!" - the filter is back and working again, smoothly as always.
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