"hippo" Keyhole fenders for tugboats are specialized rubber bumpers designed to protect vessels during docking, towing, or pushing operations. Their unique "keyhole" shape allows for secure attachment to the tug's hull while providing flexibility and impact absorption. These fenders help reduce damage to both the tug and the vessels it assists, making them a crucial component in ensuring safe maritime operations. They are commonly used in high-contact areas, offering durability and efficient shock resistance in harsh marine environments.