Help identifying a strange device in an SMPS PSU
I don’t think that cylinder is plastic. My guess is that what you have found is actually a ferrite bead: essentially a ferrite bead is a zero turn inductor
(Basically a ferrite bead is a single wire going straight through the center hole of a ferrite cylinder).

By the way there is a way to check what you have. If the cylinder itself is magnetic it’s most likely that it’s a ferrite bead if it’s not magnetic than it’s probably plastic. If that’s the case then I have no idea what you’ve got.

(: