"Enertia Propellers can be used on Mercury and Mariner outboards, plus MerCruiser Alpha One and Bravo One stern drives. Enertia propellers have forward exhaust ventilation holes that come equipped with the PVS (Performance Vent System) plugs. The size of hole in the PVS are used to vary hole shot engine RPM's and acceleration to best match the boat and boating application. See your owner's manual for the Flo-Torq hub, thrust washers and prop nut part numbers to best fit your engine or drive with this propeller. Mercury Marine’s passion for performance is matched by your drive for the new, the unknown. Our legendary reliability and durability let you boldly embrace your next adventure—large or small—knowing you’re backed by the best quality design, engineering, and materials."