The Elring O-Ring - 274040 is a type of mechanical seal used to prevent leakage between two or more parts. It is made of a circular rubber or plastic ring with a round cross-section, designed to fit into a groove and compressed during assembly between two or more parts, creating a seal. This specific O-Ring, part number 274040, is manufactured by Elring and is commonly used in various industrial and automotive applications. It is designed to be durable and resistant to high temperatures, pressure, and chemicals. This product is commonly used in engines, pumps, valves, and other machinery to prevent leaks and maintain proper functioning.