This Camp Marine Engine Donut Collar Zinc Anode is a high-quality product that is perfect for those who are looking for a reliable and durable solution. The anode is designed to fit perfectly with your marine engine, ensuring that it runs smoothly and efficiently. The brand, Camp, is known for its high-quality products, and this anode is no exception. It is made from high-quality materials, which ensures that it is built to last. The manufacturer part number, C4, is a testament to the fact that this anode is a great choice for those who want to keep their marine engine running smoothly.