The Genuine Tohatsu Marine Part is a Lower Unit Assembly (S) with the part number 3RSQ87301-0. This part is specifically designed for Tohatsu outboard motors and is a crucial component for the proper functioning of the engine. The Lower Unit Assembly includes various essential parts such as gears, bearings, and seals, all of which work together to transfer power from the engine to the propeller. It is important to use genuine Tohatsu parts to ensure optimal performance and longevity of your marine engine. The part number 3RSQ87301-3 indicates that this is the third version or revision of this particular Lower Unit Assembly, suggesting that it may have undergone improvements or updates compared to previous versions.