Can’t remove this connection between the elbow and the bottle trap, but I don’t think they’re sealed together. What is this? How do I separate them?

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https://i.imgur.com/uiVzbgi.jpg

All of the parts turn independently of one another – I can turn the highlighted part, I can turn the entire trap while holding the elbow in place, but it never unscrews. It doesn’t look like it’s part of the trap, but if it was part of the elbow, surely it would unscrew? And if it was sealed with glue, I wouldn’t be able to turn it?

Turning the parts is pretty hard too. Am I being stupid?

Edit: Mystery solved. http://imgur.com/a/6MRam2t

Might even be duct tape on that.

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