Yamaha Lower Unit Assy 6H3-45300-18-8D - Enhance the performance and reliability of your boat with the Yamaha Lower Unit Assy 6H3-45300-18-8D. This lower unit assembly ensures smooth power transfer, making it suitable for various marine environments.. Built from premium materials, the Yamaha Lower Unit Assy 6H3-45300-18-8D provides excellent durability and corrosion resistance. Its precision engineering ensures a perfect fit and easy installation, making it an ideal choice for both recreational and professional boaters.. This product has been superseded by: 6H3-45300-20-8D. 6H3-45300-18-8D - LOWER UNIT ASSY