This Genuine Cummins M11 ISM11 QSM11 Diesel Engine BELT TENSIONER 3691280 OEM is a high-quality replacement part for your engine. It is designed to fit perfectly and ensure proper tension on your engine’s accessory belts. The product is made by Cummins, a well-known and respected brand in the industry. Please note that this product may contain chemicals that are known to the State of California to cause cancer and reproductive harm.