Old style curved-bladed Fluval 104 204 impeller.
For Fluval 104 and 204 filters manufactured before January of 2001.
Curved bladed filters also have clear impeller covers - as opposed to the new clear and grey ones. If you have a straight bladed impeller and a grey impeller cover you need to replace them with those items.
The manufacturer recommends replacing this item annually for optimum filter performance.
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