Lincoln Electric Magnum PRO 400 Water Cooled Welding Guns

Top Features

  • Rated at 100% Duty Cycle.
  • Industrial Grade Construction.
  • Premium Tip Performance
  • Expendables Built for High Heat
  • OverMolded Handle Design


MIG, Pulsed MIG, Flux-Cored

Wire Diameter Range

.035-5/64 (0.9-2.0)

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Grouped product items
Product Name Qty
Magnum PRO 400 Water Cooled Welding Gun - K4521-2-10-45
Magnum PRO 400 WC Fast Mate Welding Gun - K4521-2-FM-45

The Magnum PRO Water-Cooled Welding Guns are built to tackle high-heat applications while maintaining operator comfort.

  • 100% Duty Cycle – The 400A and 500A guns run at 100% duty cycle using 90/10 mixed gas, making them ideal for high heat applications
  • Premium Tip Performance – The large diameter and mass of the Magnum PRO Copper Plus contact tips help disperse heat and keep the tips cooler, expanding their life
  • Expendables Built for High Heat – The 500A water-cooled gooseneck design keeps the nozzle cool in high-heat applications
  • OverMolded Handle Design – The soft rubber over molding enhances comfort and allows for an easier grip of the gun
More Information
SKU K4521-2
Shipping Rate 0
Custom Stock Status Availability subject to MFG stock
Free Shipping Yes
Sold As New
Product Includes
  • 60° Gun Tube – KP4527-60 (400A Guns), KP4526-60 (500A Guns)
  • Diffuser – KP4380-1
  • Insulator – KP4525-1
  • 0.045 in. Contact Tip – KP2745-045
  • 1/8 in. Recessed, 5/8 in. ID Nozzle KP4523-1-62R
  • 0.035-0.045 in., 15 ft. Liner – KP44-3545-15
Lincoln Electric Magnum PRO 400 Water Cooled Welding Guns