1127 141 9000 Stihl Spark Arrestor Genuine Stihl Part OEM 11271419000.

Stihl Models this part fits:
Stihl 029 Chainsaw
Stihl MS 290, MS 290 Chainsaw
Stihl MS 310, MS310 Chainsaw
Stihl MS 390, MS390 Chainsaw

SR-4