It worked great for my Lincoln 255 mire-o-matic! The old one I had didn't even have a # to identify it - I chose the shape, length and dose of luck - twice to be exact! The first one I bought was too short and small. This one was perfect! Note that I bought it for 250 magnum - which I have! The only reason I got lucky was because I looked at the part number where the original nozzle bolted on. I took a risk and succeeded! If only they were cheaper - I could afford to buy a few of these!