The drain plug for the fuel tank of a Citroën DS is a crucial component for maintaining this classic car. Typically made from durable metal or high-quality plastic, this plug is located at the bottom of the tank. It allows for the safe and efficient draining of the fuel tank, especially during repairs or winterizing the vehicle. Replacing the drain plug can prevent leaks and extend the life of the fuel tank. Ensure that the plug is properly sealed to avoid fuel loss and contamination of the fuel system.