The STIHL 42291402801 is an authentic OEM filter housing designed for specific STIHL chainsaw models, including the MS 261, MS 261 C-BE, MS 271, MS 271 Farm Boss, MS 291, and MS 291 C-BE. This essential component provides a secure enclosure for the air filter, protecting the engine from harmful dust and debris, thereby ensuring optimal air intake and extending the lifespan of the equipment. Manufactured to STIHL's stringent quality standards, it guarantees a precise fit and reliable performance.