Either you do the collision with a cylinder in your 3d program (1st way), or use the 3rd way that I show in this video:
I have a issue and I´d like some advices…
What´s the best approach to create a pipe with collision where I need the character to pass through the pipe sliding down???
You can juse Per Poly collision for your tube and a physicalmaterial wich is aplied to the TubeMaterial for the sliding.
You can make Per poly collision for your tube, for the sliding you have to setup a PhysicalMaterial.