EZ REV Impeller KitSpecifications:Material: PolyurethaneOuter Diameter: 2.0"Inner Diameter: 0.31"/FlatWidth: 0.87"Features:Designed Specifically For Ski/Wakeboard Ballast PumpsEZ Reverse DesignRun Dry CapableReplaces Jabsco 6303-007-P "Green Impeller"Fits Johnson Ultra Ballast Pump P/N 10-24690-03A worn or damaged impeller can cause system failure or engine breakdown. SPX's Johnson Pump brand impellers are developed and manufactured for maximum flow and long life. With a genuine spare impeller you can also be sure that you are getting the quality required by engine manufacturers and professionals.