Browse this site https://plastictongues.com/ for more information on Scupper Downspout Nozzle. Scuppers are designed to drain water off the vessel, not bring it on board and into the bilge. If you install drains to the bilge you will have effectively created a controlled sinking of your vessel. I suggest managing the water on the deck and keeping it out of the vessel. If your PVC Scupper Drain is round you can get rubber flaps for the exterior or stepped rubbers plugs that wedge in from the deck side.
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