I'm remodeling a bathroom, and I have this wall tube from the old sink drain:
I need to extend this wall tube a foot or so further out from the wall, due to the position of the new sink, and I'm wondering what's the best way to proceed. I think the wall tube is 1.25 inches in diameter and it's very shiny so I'm guessing it's chrome, but I'm a novice so I'm not sure. It appears to be soldered to the drain stub coming out of the wall; this stub pipe also seems to be 1.25 inches, except for the wider part at the end, and looks like it might also be chrome. Here's a close-up of the fitting:
Should I try to unsolder this fitting so I can completely replace the old wall tube with a longer pipe? Or would it be better to cut the old wall tube off before the elbow with a hacksaw and use some kind of compression or slip joint to attach an extension pipe to it (which would run to the P trap of the new sink).
Here's a photo of what's inside the wall -- I actually have access to see on the back side of this wall. It's in a location where I was able to reach my phone in to take this photo, but there isn't enough space here to use a wrench or any other tools to do work on this side, without demolishing part of the wall to create more space.
I'd appreciate any suggestions; thanks!