Yamaha Lower Unit Assy 6GS-45300-21-8D - Experience unparalleled performance with the Yamaha Lower Unit Assy 6GS-45300-21-8D. Built to withstand the toughest marine conditions, this lower unit assembly provides exceptional power transfer and durability for your Yamaha outboard motor. Ensure smooth and reliable operation with Yamaha's trusted engineering.. The Yamaha Lower Unit Assy 6GS-45300-21-8D is designed for optimal efficiency and easy maintenance. Perfect for a variety of marine activities, it offers consistent performance whether you're cruising or engaging in water sports. Invest in Yamaha quality for a seamless and enjoyable boating experience.. 6GS-45300-21-8D - LOWER UNIT ASSY