Mercury - Enertia ECO Propeller 16" Diameter x 19" Pitch Left-Hand Rotation 3-Blade X7 Stainless Steel Polished Finish 8M0151254. Overview. There is something deeply satisfying about feeling your boat move with purpose - that smooth surge forward when everything clicks. The Mercury Enertia ECO propeller delivers that feeling with every run. It is Designed for boaters who love to stretch their time on the water without constantly watching the fuel gauge, it's built for balance: fuel efficiency at