I have the same setup with the same infiltration areas as john3325 on my 76 23 Inboard. The rear deck hatch turns up at a 90 degree angle at the transom, water can seep in from the aft gutter if the vertical section isn't sealed. The dry storage hatch in front of the console also has 2 small drain holes at the rear of the gutter that drain to the bilge. Barry
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