Leaking floor scuppers

[Scott]

Boston Whaler dealers sell those tubes in the length that you'll need…been there done that

JonG and Miles hit the nail on the head....That wedge forward of the thru-hull creates a venturi or an area of lower pressure hence once the boat is running it sucks the water out. Any thing that has changed in front of that thru-hull could change that or like miles said ... if something is sticking past the wedges profile the opposite occurs.

Miles I would like to see that tool