Yamaha Lower Unit Assy 6H1-45300-20-EK - Upgrade your boat's performance with the Yamaha Lower Unit Assy 6H1-45300-20-EK. Engineered for precision and durability, this lower unit assembly ensures smooth and reliable power transmission for a seamless boating experience.. The Yamaha Lower Unit Assy 6H1-45300-20-EK is crafted from high-quality materials, providing excellent resistance to corrosion and wear. Ideal for both recreational and professional use, this lower unit assembly is easy to install and maintain, guaranteeing optimal performance and longevity for your marine engine.. This product has been superseded by: 6H1-45300-23-EK. 6H1-45300-20-EK - LOWER UNIT ASSY