Lincoln Magnum PRO AL FC 450 Water-Cooled Front Trigger MIG Welding Gun Electrode Holders It has a 5/16" -

It has a 5/16" - 27 tip tube-to-mixer connection and 1/4" - 27 tip connections

8 in × 28

Versatile multi-process capability supporting Stick

Connect the gun/torch lead to the negative output terminal and the work clamp to the positive terminal

(4) CO₂-heavy or nitrogen-containing shielding gas

Lincoln Magnum PRO AL FC 450 Water-Cooled Front Trigger MIG Welding Gun Electrode Holders It has a 5/16" -The Lincoln Electric Magnum PRO AL FC 450 Water Cooled Front Trigger MIG Welding Gun is a 450 amp heavy duty gun for high duty cycle aluminum MIG GMAW and FCAW production welding. Water cooling sustains safe gun and cable temperatures at amperage levels and arc on times that would quickly overheat an air cooled gun. The front trigger positions the switch at the front of the handle ergonomically preferred for overhead, vertical, and high repetition