The High Pressure Oil Rail Ball Tube O rings are designed specifically for use with 6.0L Ford Powerstroke engines. These O rings are responsible for creating a tight seal between the oil rail and the engine block, helping to prevent oil leaks. They are made of high-quality materials, ensuring a long-lasting and reliable seal. With a one year, unlimited mileage warranty, you can trust that it is built to last. By using these O rings, you can help to protect your Powerstroke engine and ensure that it runs smoothly and efficiently.