Lincoln K and KP Numbers › Lincoln Electric KP4766-1 DIFFUSER, THREAD-ON, 550A, COPPER Lincoln Electric KP4766-1 DIFFUSER, THREAD-ON, 550A, COPPER Sale Price: $29.24 Original Price: $32.75 DIFFUSER, THREAD-ON, 550A, COPPER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! DIFFUSER, THREAD-ON, 550A, COPPER PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000