What does the metal cap do in relation to the boat drain?

The metal cap serves to plug the drain from the inside, which is an essential function when ensuring the stability and safety of a boat in different conditions. By closing off the drain, it prevents water from entering the vessel while it is in transit or when it is not in use. This is particularly important to avoid water accumulation, which could lead to stability issues or the growth of mold and mildew inside the boat.

When a boat is in operation, the cap may be removable to allow for water to escape if needed, but its primary role when secured is to maintain a watertight seal. Understanding this concept is crucial in personal survival techniques, as proper boat management directly impacts safety during emergencies or adverse weather conditions.