I'd do it as a combination vector and raster image sort of like the attached. The black hose is a vector outline ("stroke" in Illustrator) and the gray highlight is the same outline converted to a bitmap and blurred a little bit. Used the eraser tool on the intersections.
I did this real quickly so it's kind of sloppy. I'd work on it a little harder if I was doing it for a customer but you get the idea...
I did this real quickly so it's kind of sloppy. I'd work on it a little harder if I was doing it for a customer but you get the idea...