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Thru Hull Flappers
That's probably not the technical term for them but I have three thru hull fittings for my deck drains and I think the flapper is there to prevent water from flowing into the boat but they seem be just as good at keeping water in. This weekend I had a boatload of kids swimming from the boat, jumping off the front, climbing up on the swim platform travel through the boat, etc, lots of water and it didn't want to drain. Has anyone had a similar experience, can I just remove the flapper? Any other suggestions?
2001 FD 228 RE 115 Evinrude FICHT
2007 SD 237 5.7L Mercruiser MPI Bravo 3