Just a guess with my limited knowledge but it might be a dinse 50

Measure it. 35-50 is 1/2" diameter.

Edit: Miller part number is 176840 for the 15' stinger.

Theres really only two dinse sizes and the smaller one is incredibly small. You have a dinse 50 iirc. I have two males you can have that i dont need (i have only tweco) ill mail them to you if you want

I got a syncrowave 180 sd after bartering a few years ago and it has everything for TIG, but i want to run some stick as well. I cannot find what size dinse connection it is. I'm pretty sure it's 35-70 but i'm not positive, and can't find anything online.

Need help with Dinse connection on syncrowave 180