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I have a 2021 160 super sport and the drain plug sits just below the water line. The manual says to leave the plug in when moored; torrential rains flood the boat with plug in. I've left the plug out without any issue as the water only fills the small recessed well at the transom and allows excess rain water to drain out. The only problem with this is that sea water grime, small shrimp, algae, end up making a mess in the well. It seems like a duckbill style valve would keep sea water out but let rain water drain....anyone aware of such a plug? Current plug is 1" threaded.