The STIHL 42380209400 is a genuine OEM decompression valve designed for a wide range of STIHL chainsaws and cut-off saws. This essential component reduces compression pressure during engine startup, making it easier to pull the starter cord and reducing wear on the starting system. It ensures reliable engine operation and extends the lifespan of your equipment. Compatible with models including MS 341, MS 361, MS 362, MS 440, MS 441, MS 460, MS 461, MS 462, MS 650, MS 660, MS 661, MS 880, TS 400, TS 410, TS 420, TS 460, TS 500i, TS 700, and TS 800.