Lincoln K and KP Numbers › Lincoln Electric KP2743-1-50F NOZZLE 550A, THREAD-ON, FLUSH, 1/2 ID Lincoln Electric KP2743-1-50F NOZZLE 550A, THREAD-ON, FLUSH, 1/2 ID Sale Price: $33.14 Original Price: $37.12 NOZZLE 550A, THREAD-ON, FLUSH, 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! NOZZLE 550A, THREAD-ON, FLUSH, 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000