Lincoln K and KP Numbers › Lincoln Electric KP2743-1-50S NOZZLE 550, THREAD-ON, 1/8SO 1/2 ID Lincoln Electric KP2743-1-50S NOZZLE 550, THREAD-ON, 1/8SO 1/2 ID Sale Price: $33.14 Original Price: $37.12 NOZZLE 550, THREAD-ON, 1/8SO 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! NOZZLE 550, THREAD-ON, 1/8SO 1/2 ID PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000