I have a Nu Tool NW101-2 , its a gas/no gas mig welder with dc output so would expect yours may be the same , it has two dinse sockets on the front with + and - so you can reverse the polarity to the torch for gas/gasless . The torch itself looks identical to a Murex MXE type but of course its a cosmetic similarity only and the quality of it is very questionable in my opinion and it always makes me suspicious when a low end manufacturer like Nu Tool copy the design of a market leader , they would serve themselves better to use their own designs .