I came across a small problem when disconnecting the drain line. the last plumber (assuming it was done by one...) installed the drain by inserting the 1.25" drain line directly into this coupler and then soldering it shut. I tried to melt the solder and to remove the coupling, but so far, no luck. Any bright ideas out there on the best way to either remove this or otherwise attach the new drain line? And yes, I did notice the debris in the pipe that you see in the picture, I will clean it out.
Dan