There is this kind of tube that prevent me to use any kind of wrench to unscrew the nut in it. But without unscrewing it, I cannot get the faucet out of its place at all.
[![enter image description here][1]][1]
Is there a simple trick, or tool, that would allow me to go up there unscrew it. That tube is ~ 5 to 6 inch long.


  [1]: https://i.sstatic.net/4XES2.jpg