What purpose does the rubber ball in the boat drain serve?

The rubber ball in the boat drain primarily functions as a check valve. This mechanism allows water to drain out of the boat while preventing any backflow of water from the outside into the vessel. When the boat is in the water, the ball resides in a position that permits water to exit but seals off the drain when the boat is out of the water or experiences a change in pressure, thereby maintaining the boat’s buoyancy and integrity.

The ability to manage water effectively is crucial for safety and keeping the boat buoyant, especially in emergency situations. In a survival context, ensuring that the boat remains free of excess water can be vital for maintaining stability and minimizing the risk of capsizing.