Outboard drive unit for boats, including an underwater housing, in which two propeller shafts are mounted and are driven via a first bevel gearing enclosed in the underwater housing, and a second bevel gearing enclosed in a gear housing. The pass-through connectors easily attach to the screens to allow for a permanent pass through to exist between an interior space and an exterior space that is separated by a screen wall. The mechanical stop is coupled to the support and reduces an amount of vertical deflection allowed to an associated leaf spring. The U-shaped bracket defines first and second interior side edges and an interior rear edge.