This is a genuine Caterpillar 1R-0659 engine oil filter, also known as 9: Purolator L57151 and Motorcraft EFL228. It is compatible with various models and part numbers, including 4A-0339, 4J-4195, 4W-4840, 9F-6427, 9F-6430, and 9Y-45201R-0659. The filter is designed to ensure that your engine is free from contaminants, ensuring optimal performance and longevity. It is a high-quality product that is perfect for inboard engines and components.