i am guessing on the 1/8" it was in boat when i picked it up
i will have to check the tube to see what size it is

i paid 10.00 for this boat 20" long deep v plywood and balsa construction motor mount /tube and cooling pickup were in boat . fuel tank in bow but one line kinked and other one plugged up so i cut them off flush with wood
plywood is sig and was .49 cents for 1/8x3x36" sheets so that tells you how old it is
i dont have much in boat just trying to adapt the os.20 that i had on grandsons air boat
and using radio from a old traxxas hawk 2 truck. made exhaust from copper tube
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