This set consists of four brand new residual pressure valves including the appropriate ones connectors. These valves are a cost-effective repair solution as they are often the cause of defects in the air suspension and can be replaced individually instead of replacing the entire air suspension strut. The valves function as pressure relief valves and ensure that a defined residual pressure remains in the system to protect the air bellows from damage (such as kinking when unpressurized). The article is located in Germany. For buyers outside the European Union, import duties may be levied by the customs of the respective country. Please check before purchasing. The item is located in Germany. Buyers from outside the European Union may be charged import fees by customs in their country. Pleas.