STIHL Carburetor OEM , New in the box.  Check your C1Q number for a match before ordering.  C1Q-S186D.  Stihl part number is 4140-120-0619. This carb fits all FS55R *FS55* FC55*FS45*FS46 Stihl line trimmers.  THIS IS NOT A CHINESE KNOCKOFF.   This is an OEM part.   We only sell original parts from Stihl.