Should they be open or closed most of the time? Do they often leak when older ? 25 foot Alum hulled Rib has been noticeably taking on water this year. I closed the scuppers today. I figured someone here could educate me on scuppers. I felt I would close them for a week and see if it stops. If not then it's likely not them.
Scuppers should be self draining. On big RIBs, they get wet. Never had a problem with a hull filling up by it's self.
The scuppers on this boat are under the waterline. They appear to have a one way door or ball that allows water out but not in. The decks are also self draining.