Those plastic flapper rings are destroyed. Easy entire replacement."Seadog Marine" make them for under $5 @ Basspro or the like. Just Google them or go the Gucci thing and buy Gemlux with thru hull scuppers W/ replacement screw in type flappers.
https://gemlux.com/search?q=thru%20hull%20scupper
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1978 23' Superfish/Potter Bracket 250HP --------
as "Americans" you have the right to ......
"LIFE, LIBERTY and the PURSUIT of a Classic SeaCraft" -capt_chuck
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