This genuine Stihl 42420201201 cylinder with piston assembly is an authentic OEM replacement part designed for Stihl SR 430, SR 450, BR 430, and BR 450 backpack blowers. Featuring a 33mm bore, this critical engine component ensures precise fitment and restores original engine compression and power. Manufactured to Stihl's rigorous quality standards, it guarantees reliable performance and durability for demanding professional and homeowner applications. Replace worn or damaged cylinders and pistons with this OEM part to maintain the longevity and efficiency of your Stihl equipment.