In my situation where I had to cut the copper very close to the old valve so that the new valve would fit there was a lot of solder on the pipes. This can either be filed off or you can heat up the copper and wipe off the blotches of solder with a dry rag when it runs. Careful not to burn yourself when you do it this way and have a spray bottle and fire extinguisher handy whenever you use the torch. Finish by sanding off any remaining solder and making sure it’s clean all the way around the pipes.


