This air crossover connection fit is compatible with Cummins engines K19, K38, K50, QSK NT14, and NT855. It is designed to ensure optimal performance and reliability of your heavy equipment. The connection fit is manufactured in China and is designed to meet the highest standards of quality and durability. This item is perfect for those who own or operate heavy equipment that requires a reliable and high-quality air crossover connection fit. It is compatible with a wide range of Cummins engines, making it an ideal choice for those who want to ensure the best performance and reliability for their equipment.