Draw tube going through donut

Hi, this is my first thread.

I'm wanting to know the best way to draw a tube going through a donut, as in the attached example.  I'm guessing it's pretty simple, but I've tried clipping masks, pathfinder etc and can't quite get my head around it.  I could just draw it with the pen, but I'm guessing there's a quicker way.

Thanks for your help