Lincoln K and KP Numbers › Lincoln Electric KP4380-1-B25 SA GAS DIFFUSER, 550A Lincoln Electric KP4380-1-B25 SA GAS DIFFUSER, 550A Sale Price: $609.38 Original Price: $682.50 SA GAS DIFFUSER, 550A PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000 Add To Cart Added! SA GAS DIFFUSER, 550A PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000