I'm not sure about all of them but I think most pontoons have a plug on the end.

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Have water in pontoons,anyone know how to fix,cost etc.?Any help would be appreciated!
I'm not sure about all of them but I think most pontoons have a plug on the end.
I had water in my toons. I removed the plugs and was able to get some schrader valves from plumbing supply house. put the schrader valves in the openings and put a little air in (not to much though). listen for the leak.
Where the leak is depends how you might fix it. Mine was on a seam up front, but no crack so I used epoxy putty and sanded it. Leak fixed.
good luck
