Lincoln K and KP Numbers › Lincoln Electric K3131-3 MAGNUM PRO 350 DUAL PROCEDURE, 20' Lincoln Electric K3131-3 MAGNUM PRO 350 DUAL PROCEDURE, 20' Sale Price: $910.48 Original Price: $1,019.74 MAGNUM PRO 350 DUAL PROCEDURE, 20' PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! MAGNUM PRO 350 DUAL PROCEDURE, 20' PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000