Help with modeling this mask hose.

 From:  Robert (ROBERT_S)
10840.19 In reply to 10840.15 
Hello Michael,

I'm sorry if my explanation confused you.

I just want make the hose as on the image, without that deformation that happen when i follow the curve.

Here is video of my process: https://www.youtube.com/watch?v=PhpuPDRsMrM

Maybe someone can tell me, what im doing wrong and how to avoid the deformation.