Yamaha Lower Unit Assy 6H1-45300-21-EK - Enhance your marine engine's performance with the Yamaha Lower Unit Assy 6H1-45300-21-EK. Designed for robustness and precision, this lower unit assembly ensures reliable power transmission and smooth operation on the water.. The Yamaha Lower Unit Assy 6H1-45300-21-EK is built from top-quality materials, offering exceptional resistance to corrosion and wear. Perfect for both recreational and professional use, this lower unit assembly is straightforward to install and maintain, providing long-lasting performance and dependability for your boat.. This product has been superseded by: 6H1-45300-23-EK. 6H1-45300-21-EK - LOWER UNIT ASSY