Ensure your boat's cooling and charging systems stay fully operational with the Mercury/Quicksilver 48120Q V-Belt (also cataloged as 57-48120Q1). This genuine factory OEM replacement part features a precision-molded 46-inch length designed to perfectly fit compatible Mercury outboard and MerCruiser sterndrive engine configurations, such as the widely used 4.3L V6 setups. Built from premium-grade, heat-resistant rubber reinforced with durable synthetic cords, this heavy-duty belt is engineered to withstand high-RPM marine environments without stretching, cracking, or glazing. By providing a secure, slip-free grip across your alternator and water pump pulleys, it prevents critical battery drops and engine overheating, delivering the reliability you need for a worry-free season on the water.