OMC Stern Drive Impeller Kit | Sierra 18-3286 Water pump impeller kit for OMC electric shift & Stringer stern drives from 1964-86. Sierra OMC water pump kit Fits OMC electric shift and Stringer model stern drives from 1964-1986 Contains four o-rings, wear plate, rubber seal, and impeller Does not include housing Replaces OMC 983218 Replaces Mallory 9-45284