OEM Part Number: 4238-140-0611

Fits Models: Stihl TS410 & TS420 cut-off saws (and sometimes TS440 series in aftermarket listings) 

Includes: Muffler unit; many aftermarket versions also include gasket and cooling plate 

Function: Reduces exhaust noise and directs exhaust away from operator; essential exhaust component for 2-stroke saw engines.

Genuine OEM parts (e.g., New OEM Stihl 4238‑140‑0611 Muffler Assembly) will match factory spec.