Sierra 18-3217 Impeller Kit for Mercury #1 Drives through Serial Number D494568, Non-Retail Packaging Kit Contains: (1) Water Tube, (1) Impeller, (7) Gaskets, (1) Grommet, (1) Seal Ring, (1) Plate and (6) O-Rings in Non-Retail Packaging Sierra Impellers are molded to maintain high quality standards and have been inspected and tested for proper bonding and performance Impeller is made from a neoprene rubber compound for added flexibility and long lasting performance Made to meet or exceed Original Equipment specifications for quality and performance All Sierra parts qualify for and are covered under Sierra's Industry Leading Customer Satisfaction Warranty Before Ordering, Please Verify this is the Correct Part for your Application. For Assistance, Please Call Sierra's Tech Support at 1-877-663-8396