The Johnson Pump 09-1026B-1 Impeller Kit is developed and manufactured to provide maximum flow and a long life. Replaces Jabsco 6303-001 impellers.• Provides a significantly long service life• Designed for maximum flow• Genuine replacement for worn or damaged impeller• Replaces Jabsco 6303-001• For use in Johnson Pump F4 PumpDimensionsOutside Diameter: 5.08 mm / 2"Inside Diameter: 12.7 mm / 0.50"Width: 22.0 mm / 0.87" For use in Johnson Pump F4 Replaces Jabsco 6303-001 2"" O.D. / 0.5"" I.D.