Lincoln K and KP Numbers › Lincoln Electric KP2743-1-50R NOZZLE 550, THREAD-ON, 1/8R 1/2 ID Lincoln Electric KP2743-1-50R NOZZLE 550, THREAD-ON, 1/8R 1/2 ID Sale Price: $38.02 Original Price: $42.58 NOZZLE 550, THREAD-ON, 1/8R 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! NOZZLE 550, THREAD-ON, 1/8R 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000