47-89982 47-65958 18-3052 Outboard Parts Impeller for Mercury 20hp Outboard Motors Number of Blades: 6, Brass Hub Height: 18.76mm External Impeller Overall Diameter: 51.41mm Internal Shaft Insert Diameter: 15.92mm Net Weight: 30g A External Impeller Overall Diameter: 51.41mm B Height: 18.76mm C Internal Shaft Insert Diameter: 15.92mm Net Weight: 30g Number of Blades: 6 Brass Hub