I haven't opened it, but assume it is the USCG required fuel tank connection/inspection plate for the forward 50 gallon tank?
I ordered some mcmaster carr fiberglass square tubing today. $10 per 5 foot length. To hold tanks down/in without rotting away, unlike the previously installed 2x 4s. A mushy 2x4 was holding the aft tank in place. I just about shoveled it off the top of the tank! I literally scooped some of it up with my hands. Decomposition in action!
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