The CEF nitrile flexible impeller is suitable for applications where diesel or light oils are present. The CEF flexible pump impeller is designed to be installed to some of the F4 range of Johnson Pumps which suits the impeller dimensions listed below, including:

- F4B-19 pumps (10-24512-01, 10-24512-02, 10-24689-01 & 10-24689-02), F4B-1907 pumps (10-24512-03, 10-24512-04, 10-24689-03 & 10-24689-04)

- F38B-19 pumps (10-24727-01 & 10-24727-02), F38B-1907 pumps (10-24727-03 & 10-24727-04)

The CEF flexible pump impeller has six blades / vanes.

The CEF 500201X can be used to replace the Johnson 09-824P-9 and Jabsco 6303-0003 Europe and USA flexible impeller.