Lincoln K and KP Numbers › Lincoln Electric KP5707-4 MAGNUM PRO HDE 550 FLEXIBLE GUN TUBE Lincoln Electric KP5707-4 MAGNUM PRO HDE 550 FLEXIBLE GUN TUBE Sale Price: $251.71 Original Price: $281.92 MAGNUM PRO HDE 550 FLEXIBLE GUN TUBE PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! MAGNUM PRO HDE 550 FLEXIBLE GUN TUBE PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000