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Almost sunk my boat

I purchased the Attwood SS scupper, but I will take @Julian advice, and wait a couple of years. I grabbed a hold of my plastic one today and it's solid.
 
I didn't get a chance to take any video, but I was able to take a few pics while it was on the trailer. I can verify that when it's on the water and there's any water in the bottom of the boat, way under, in the actual bilge, when it bobs up and down, such as when you walk over to look down into the ski locker, it will fill and empty with the movement of the boat. This may not happen to everyone, because I discovered today that there was zero sealant around/under the fitting that holds the plug in the ski locker. I'll clean it up eventually, add some sealant, and reinstall my fitting. As it currently is, it doesn't stop any water from coming in, so in my mind, it doesn't matter that it's been removed for the time being. As long as my boat is draining as it should, I won't get any more or any less water than what currently occurs. With the ski locker drain plug in, it simply slows the entry of water. The reverse is true also, it slows the EXIT of water with the plug in. It drains perfectly fine, so the ACTUAL problem is that there's too much water in the bottom of the boat, causing it to back up into the ski locker when it gets high enough.

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How about something like this?
 
For the ski locker, it's not necessary. The new fitting should have an o-ring and seal up just fine with some sealant around the fitting.
I was proposing as a temporary fix.....I plan on changing the flange and plug.
 
I didn't get a chance to take any video, but I was able to take a few pics while it was on the trailer. I can verify that when it's on the water and there's any water in the bottom of the boat, way under, in the actual bilge, when it bobs up and down, such as when you walk over to look down into the ski locker, it will fill and empty with the movement of the boat. This may not happen to everyone, because I discovered today that there was zero sealant around/under the fitting that holds the plug in the ski locker. I'll clean it up eventually, add some sealant, and reinstall my fitting. As it currently is, it doesn't stop any water from coming in, so in my mind, it doesn't matter that it's been removed for the time being. As long as my boat is draining as it should, I won't get any more or any less water than what currently occurs. With the ski locker drain plug in, it simply slows the entry of water. The reverse is true also, it slows the EXIT of water with the plug in. It drains perfectly fine, so the ACTUAL problem is that there's too much water in the bottom of the boat, causing it to back up into the ski locker when it gets high enough.

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View attachment 129212
This is happening to me too. Did you find the problem?
 
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