Lincoln K and KP Numbers › Lincoln Electric KP4380-1 GAS DIFFUSER, 550A Lincoln Electric KP4380-1 GAS DIFFUSER, 550A Sale Price: $25.25 Original Price: $28.28 GAS DIFFUSER, 550A PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000 Add To Cart Added! GAS DIFFUSER, 550A PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1.000