Part Number: For Echo A021001921, A021001920 For Walbro WT-985 Fitment: For Echo CS-370, CS-400, CS-400F & Shindaiwa 402s 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 S/N C09212060001-C09212999999 CS-400 S/N: C10013001001 - C10013999999-->Carburetor S/N C10013017101-C10013999999 CS-400 S/N: C33714001001 - C33714999999-->Carburetor CS-400 S/N: C69715001001 - C69715999999-->Carburetor CS-400F S/N: C27812001001 - C27812999999-->Carburetor CS-400F S/N: C27911001001 - C27911999999-->Carburetor CS-400F S/N: C28013001001 - C28013999999-->Carburetor CS-400F S/N: C33814001001 - C33814999999-->Carburetor CS-400F S/N: C69815001001 - C69815999999-->Carburetor Shindaiwa 402s S/N: C37414001001 - C37414999999--> Chainsaw Carburetor Shindaiwa 402s S/N: C37513001001 - C37513999999--> Chainsaw Carburetor Shindaiwa 402s S/N: C69915001001 - C69915999999--> Chainsaw Carburetor Package includes: 1x Carburetor 2x Gasket 1x Air Filter 1x Fuel Filter 2x Fuel Line 1x Spark Plug 1x Grommet 1x Adjustment Tool