My experience is you need to be strong armed. They are sealed in at the factory with a sealant that may have oozed inside the outer skin and formed a bead there. No way to get at it, so you PULL. You can even remove the outer flange and PUSH it in, if you can get at the thing to remove from the interior. That sealant also may be on the bottom, so again, removing the flange may allow you to put a sharp putty knife along the bottom to cut the stuff. Since you are replacing it, who cares if you destroy the heater itself. Just be careful of the Airstream.
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