Lincoln K and KP Numbers › Lincoln Electric KP5707-3 MAGNUM PRO HDE 450 FLEXIBLE GUN TUBE Lincoln Electric KP5707-3 MAGNUM PRO HDE 450 FLEXIBLE GUN TUBE Sale Price: $241.64 Original Price: $270.64 MAGNUM PRO HDE 450 FLEXIBLE GUN TUBE PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! MAGNUM PRO HDE 450 FLEXIBLE GUN TUBE PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000