It is the Air-Cooled MB 14AK MIG Welding Torch. It is a special version 15AK torch, it is with gas valve integrated in the torch body, it is also called 14AK. It is the most popular solution for DIY MIG application. The ergonomic design for welding works with a comfortable fully insulated Nylon handle, fits comfortably in the palm and helps to decrease operator fatigue. Specification:

Welding Current	10-150A.
Rated Current	150A@25%.
Wire Capacity	0.6mm-1.2mm.
The default contact tip is 0.8mm.
Consumables	It is compatible with 15AK tips and nozzles. The tip holder is specialized for 14AK.