Lincoln K and KP Numbers › Lincoln Electric KP3155-1-B25 MAGNUM PRO 550A, 1/4" RECESSED DIFFUSER Lincoln Electric KP3155-1-B25 MAGNUM PRO 550A, 1/4" RECESSED DIFFUSER Sale Price: $365.63 Original Price: $409.50 MAGNUM PRO 550A, 1/4" RECESSED DIFFUSER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000 Add To Cart Added! MAGNUM PRO 550A, 1/4" RECESSED DIFFUSER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000