What is this Seal too?

[SteveMM62Reef]

I got this Seal in a Box of Junk, that came with a used Aquarium Purchase. Does anyone know what it goes too? It doesn’t fit anything I have.

 

[landlubber]

could be something from an old canister filter or something.
i suppose it depends who packed the box you found it in. non-aquarium people will either put anything and everything that looks like it relates OR they throw away vital pieces thinking they'll never use them again.

 

[ca1ore]

Looks like a foam/rubber surround from a speaker driver LOL. My guess is nothing to do with an aquarium.