Lincoln K and KP Numbers › Lincoln Electric KP4766-1-B25 DIFFUSER, THREAD-ON, 550A, COPPER Lincoln Electric KP4766-1-B25 DIFFUSER, THREAD-ON, 550A, COPPER Sale Price: $681.25 Original Price: $763.00 DIFFUSER, THREAD-ON, 550A, COPPER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000 Add To Cart Added! DIFFUSER, THREAD-ON, 550A, COPPER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 25.000