I was going to suggest wrapping a piece of thin rubber material around it and then securing top and bottom with zipties but for submerged water might still get in there.
I previously used a laguna pond pump and needed to use a gear clamp which rusted too. Not sure what I would have done if it was submerged sorry. You can get larger plastic clamps off BRS I think but I didn't trust one against 3000 gph.
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