The STIHL SV11280343000 is an authentic OEM compression ring, also known by the official part number 11280343000, designed for specific STIHL chainsaw models. This piston ring features a diameter of 42.5 mm and a thickness of 1.2 mm. It is a critical component for maintaining optimal cylinder compression, preventing gas leakage past the piston, and ensuring efficient power delivery. This genuine STIHL part is compatible with models including MS 250, MS 250 C, MS 230, MS 230 C, MS 210, MS 210 C, 025, 023, and 021. Manufactured to STIHL's rigorous quality standards, it provides a precise fit and durable performance, essential for engine longevity and reliability.