Feature●This product is a U-Joint Bellows Installer Tool that is designed to replace Sierra 18-9870 and Mercury MerCruiser 91-818162.●It is specifically designed to fit Alpha 1 Gen 2, Bravo, and Blackhawk U-Joint Bellows, making it a versatile tool for boat mechanics or DIY enthusiasts.●The tool is designed to install the aluminum ring into the u-joint bellows safely and effectively without damaging the ring or the bellows.●This tool is often used in conjunction with the exhaust bellow expander tool, enhancing efficiency and speed when installing or repairing boat exhaust systems.●By choosing this high-quality U-Joint Bellows Installer Tool, you can safely and easily complete repairs or maintenance on your boat exhaust system, ensuring smooth operation and performance.Description