Used to remove a VERY stuck VERY old sewer pipe plug. Before deployment, three very strong men and women, a large number of wrenches and a few tears of frustration couldn't get the damn thing to work. I've never had retaliation like that stupid pipe plug. With a little help from the cheat bar, she even destroyed the sink key. But then my local plumbing company recommended penetrating the oil (and hitting it really hard with a hammer). A command from Revane, a few prayers, and a personal vendetta later. Voila! This whole shell is still my enemy, but at least I can wage war on other battlefields. TLDR: I highly recommend Liquid Key. It worked when nothing else worked.