The plugs on the bottom are so you can drain them. With plugs on the top you have to use some type of reducer on a shop vac to get the water out.
I have one pontoon that may have a quart of water in it by the end of the season and I jut take the plug out and let it drain. I am not sure if it is leaking or that is just condensation but it is a small enough amount that it doesn't matter.
Someone above recommended East Coast Welding. I have also used East Coast Welding in Gilford and they do a great job. I know that they do a lot of aluminum welding. For many years they have been making a lot of the aluminum docks for Watermark.
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