I have a 2003 21' Seacraft and I am pretty sure my live well is very similar to yours. I had the same problem with rain or wash water filling it. I purchased an in deck water tight hatch lid and installed it in the center of the existing lid. I completely sealed the existing lid to make it water tight. This not only made it water tight but also it now is a pressurized live well which helps with keeping the bait alive. Another way water will get in is thru the overflow drain when the boat is at rest in the water. On my boat the drain exits the boat slightly below water level and sea water will seep back in as the boat is at rest. I purchased a simple drain plug at a plumbing store like you would use on a bath tub drain. I think it is 1 1/2". I keep it plugged unless using the livewell. Hope this helps and if you have any questions let me know.
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