This high-quality oil filter from Sierra is the perfect replacement for your old or worn-out filter. It is specifically designed to fit a variety of outboard engines and is manufactured in Taiwan to meet industry standards. With its reliable performance and durability, you can be sure that your engine will run smoothly and efficiently. The Sierra oil filter (part number 18-7878-1) replaces OEM part numbers 803470, 502904, and 3517857. It is suitable for use in a range of boats and watercraft, and is an essential component for maintaining the health and longevity of your engine. Whether you're a professional marine mechanic or a DIY enthusiast, this filter is an excellent choice for keeping your engine running smoothly.