47-22748 18-3012 Outboard Engine Impeller for Mercury 3.5HP 3.9P 5HP 6HP Boat Motor Number of Blades: 6, Net Weight: 13g Brass Hub Height: 14.20mm External Impeller Overall Diameter: 31.61mm Internal Shaft Insert Diameter: 11.60mm A Overall Diameter: 31.61 mm B Height: 14.20 mm C Shaft Diameter: 11.60 mm Net Weight: 13 g Number of Blades: 6 Brass Hub Material: Neoprene Use: Cooling Systems (Water) Condition: New Installation Instructions: Lubricate with silicone grease, glycerine or dish soap when installing. (Not included).