We're selling our home and the inspectors discovered a leak in one of the bathroom sink drains. I figured I'd find a junction at the trap that would be easily addressed. Unfortunately, that's not the case.
The leak is coming from the joint where the black stub connects to the fitting (white) that protrudes from the wall. It leaks quite a bit from about the seven o'clock position. The joint appears to be threaded but I'm not 100% certain of that. I tried twisting it by hand, but it didn't budge. I wasn't inclined to put a pipe wrench on it before asking for help here, for fear of tweaking something behind the wall, and creating a real mess.
Is this likely a threaded joint and, if so, if it was properly installed should I be able to remove it with a pipe wrench and re-seal it?
I'm inherently cheap so I really don't want to call a plumber, but I also don't want to either make a bigger problem out of what should be a relatively small one.
PPOT Brain Trust advice appreciated.
