The Elring Coolant Pipe O-Ring - 198490 is a replacement O-ring for the coolant pipe in a vehicle's cooling system. It is designed to create a tight seal between the pipe and other components, preventing leaks and ensuring proper flow of coolant. This O-ring is made from high-quality materials to withstand the extreme temperatures and pressure of the cooling system. It is a necessary component for maintaining the efficiency and functionality of the vehicle's cooling system.