Applicable models:Fit Echo CS-370, CS-400 CS-370 S/N: C33714001001 - C33714999999 -> Carburetor CS-400 S/N: C08111019801 - C08111999999 -> Carburetor S/N C08111019801-C08111999999 CS-400 S/N: C09212001001 - C09212999999 -> Carburettor S/N C09212060001-C09212999999 CS-400 S/N: C10013001001 - C10 013999999 -> Carburetor S/N C10013017101-C10013999999 CS-400 S / N: C33714001001 - C33714999999 -> Carburetor CS-400F SN C27812001001 - C27812999999 -> Carburetor CS-400F SN C27911001001 - C27911999999 -> Carburetor CS -400F SN C28013001001 - C28013999999 - > Carburetor Part Number: A021001921 A021001920 For Walbro WT-985 Packing List: 1 x Carburetor, 1 x Fuel Line. NoteIf you encounter any problems in the purchase process, you can contact me at any time, we are online 24 hours a day, you are welcome to enter the store for consultation Warm advice: please , you can evaluate our products after you receive them, thank you for your support If you need to buy in bulk, you can contact me, I will give you an appropriate discount > "Applicable models: Fit Echo CS-370, CS-400 CS-370 S/N: C33714001001 - C33714999999 -> Carburetor CS-400 S/N: C08111019801 - C08111999999 - > Carburetor S/N C08111019801-C08111999999 CS-400 S/N: C09212001001 - C09212999999 -> Carburetor