SSM VI Aerator KitThis custom prop aerator kit is designed to allow air to the propeller which helps large boats with radical engines come on plane easier. In pleasure applications, the aerators take the load off of the props when maneuvering around docks, and help to prevent engine stalling when engines are shifted into gear. In race conditions, aerators improve throttle response coming out of corners or after hitting down on a big wave by instantly relieving the load off of the propellers. Hose and clamps included.Requires drilling a 3" diameter hole in the top of the lower drive. Lower stainless piece is cut to fit and must be custom fit to your propeller.