Impeller 47-96619M 47-84027M 47-84027T 18-3074 for Mercury Mariner 9.9HP 15HP 9.9C 15C 15K W15 Outboard Motor Number of Blades: 6, Net Weight: 10g Plastic Hub Height: 21.94mm External Impeller Overall Diameter: 39.54mm Internal Shaft Insert Diameter: 13.20mm