Johnson Pump Threaded Impeller fits both stock Johnson pump and Indmar aftermarket pump. Gasket included. Composite aluminum, plastic, and cast iron construction of original water pumps does not hold up in marine environments. Now you have the choice to replace the complete pump assembly, the end cover only, or the impeller with a more durable, longer lasting pump. | Threaded Impeller with Gasket, Johnson #09-812BT (for Indmar engines)