This O-Ring Adapter is designed to perfectly fit Cummins Engine models KTA19, KTA38, KTA50, and NT855. Crafted in China, this unit quantity of one is ideal for those in need of a reliable and high-quality adapter for their commercial truck parts. The manufacturer part number 3631471 is proof of the excellent engineering standards that have gone into the making of this product. Purchase this adapter with confidence and rest assured that it will seamlessly integrate with your engine and enhance its performance.