Snap On MW120 MIG Welder

Snap On used many different manufacturers over the years to make welders for them. Basically whoever was cheaper. I do think that this was one that Snap On had made themselves. Don't let the 120 fool you though as many manufacturers started playing games with the number designation over the years. I do believe it is an 80 amp output with a 30% duty cycle but that is going off of memory as it has been a couple years since I have had one in to repair. As said for a gun liner a standard tweeco liner will work and a welding supply store would be your best bet