By replacing it with a genuine hull drain plug, it is possible to drain the water inside the ship during planing. The ball inside the product moves due to the inertial force of the hull, and the water pressure moves the ball inside during acceleration and deceleration to prevent water from entering the ship.
[Caution] *Please do not stop the vessel for a long time. (Water will not be drained because there is no inertial force while anchored.)