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Jim, you described the exact issue with these (I have a '23 130 super sport). For me, the least worst option is to leave the plug in, and bail the water out manually with my bilge pump, or take the plug out when I get to the boat. I keep it in a slip and I'd rather not leave the plug out and deal with ocean water in the bilge.

My 210 Montauk has scuppers which are great. I've seen aftermarket scuppers available -- as small as 1-1/2" diameter but never as small as 1" to fit these boats.

Have you considered a small Rule bilge pump and float switch wired directly to the battery? That way you keep the aft plug in all the time and the pump would take care of any rainwater that collects in the bilge.