Genuine STIHL air filter (carburetor box) cover, part #1127-140-1903 / 11271401903, compatible with MS290, MS310, MS390. OEM quality ensures proper sealing, helps maintain correct airflow, and protects the carburetor and filter from dirt & debris.

✅ Authentic OEM Cover – Original STIHL air filter / carburetor box cover, part number 11271401903, for guaranteed compatibility and fit.
✅ Fits Key STIHL Models – Designed for MS290, MS310, MS390 chainsaws.
✅ Complete with Locking Knob – Includes the locking (MN) knob so you get everything you need for secure attachment.
✅ Durable Protection – Shields the air filter and carburetor from moisture, dust, and debris, helping prolong engine life.
✅ Easy Replacement – Straightforward swap-out, no modification required — keeps saw running clean and smooth.