Impeller Kit | Sierra 18-3047 SIERRA Impeller Kit | 18-3047 Impeller Kit 12 blade impeller 2 9/16 in. diameter 1 5/8 in. width Gaskets included Replaces Crusader 20310, R061017, RP061017 Replaces Oberdorfer 8922 Replaces Volvo Penta 835874 Replaces Mallory 9-45706 Replaces Sierra 18-3061