Authentic Stihl OEM replacement piston, part number 41800302001. This essential engine component is designed to move within the cylinder, converting the force of expanding gases into mechanical energy. It ensures reliable performance and is compatible with a wide range of Stihl trimmers, brushcutters, hedge trimmers, and blowers including FS38, FS45, FS45C, FS45L, FS46, FS46C, FS55, FS55C, FS55R, FS55RC, FS55T, HL45, HS45, KM55, KM55C, KM55R, KM55RC, BG45, BG46, BG55, and SH55 models.