Hydro-Stabilizer Jr for Outboards Under 50 Horsepower. This Attwood Hydro-Stabilizer gives outboards under 50 horsepower a performance upgrade by enhancing their stability and handling. This Hydro-Stabilizer reduces drag when the hull gets on the plane. It quickly puts the boat on the plane and helps pull skiers out of the hole faster. Even at lower RPMs, it keeps the boat on the plane, and its innovative wings provide a smoother, more stable ride.Features: It is made of durable black molded plastic, and reduces prop cavitation in turns . Comes with stainless steel bolts and lock nuts. Provides a performance upgrade by enhancing stability and handling. It can be installed on a wide variety of outboards under 50 horsepower.