15 Series (180A) flex neck MIG gun with a 4-pin Amphenol trigger connection (only two pins used, though) for select Auto Arc®, Hobart®, MAC Tools®, and Miller® welders. Uses consumables. To remove the gas nozzle, twist clockwise and pull. To install the gas nozzle, twist clockwise and push. 

Please Note: Do not bend the flex neck into a complete U-shape—the neck can crack.  Also, the handle on the gun can be either blue and black or red and black.