Here is a pic of mine when I put in the plastic tank.
I looked for the thread, but cant find it.
I am pretty sure I used "Great Stuff" foam, it hasn't moved yet.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.