The rubber ball that forms the automatic closing valve is located where?

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The rubber ball acts as a check valve in the drain system, so it can automatically seal off the drain when water isn’t actively flowing out, preventing backflow into the boat. Placing it in the cage of the drain below the hull bottom puts the ball right in the drainage path where it can be pushed aside to let water out during draining, and then drop back into place to seal when flow stops or pressure reverses. This location is essential because it keeps water from re-entering the boat when waves or movement create back pressure in the drain line.

It's not in the bilge near the pump, because that area is for pumping out water, not for preventing backflow from the drain. It's not in the hull bottom itself, since the valve needs to be part of the drain assembly to function correctly. It's not in the drain cap, as the cap is simply an access point, while the automatic closing valve needs to sit in the drain path to perform its sealing action.