Possible bilge water sourceSeveral years
Several years ago i was puzzeled by the unwanted water that at times came over the low side of the cabin sole while under sail.Stuffing box minimal drip,all thru hulls and hoses dry-whats going on? Finally [after better than a year of this] discovered source.When heeled under choppy conditions, the water on deck on the high side travels to the stern and flows thru the bilge vent and of course straight to the bilge.The cure?Epoxied small dam 1/2 inch to bottom of vent.This cured under sail problem but remember,vent is still open to wind driven rain and since i live on board is no problem to stuff two sponges in when hard rain. Mine is 79 27'may have different config than yours so this may be for nought.