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A fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having opposite ends, one of the ends being blunt

A fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.

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A fluid pump assembly comprising a substantially circular drive shaft including a flat side, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and defined, in part, by an a

A fluid pump assembly comprising a substantially circular drive shaft including a flat side, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and defined, in part, by an arcuate surface including a first end which extends smoothly from said bore, and a retainer key positioned in said keyway and having an arcuate surface complementary with said arcuate surface of said keyway and including an end, a flat surface which has a first end extending from said end of said arcuate surface of said retainer key, which is complementary with said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.