AIR FILTER COMPATIBLE WITH : STIHL Chainsaw: MS 231, MS 231 C, MS 251, MS 251 C MS 271, MS 291, MS 311, MS 391, MS 362 C Height in mm: 43,00 Air Filter Design: Round Outer diameter in mm: 79,00 Inner diameter in mm: 45,00 STOCK NUMBER: 176-939 ORIGINAL CODE: STIHL 1141 120 1600 CZ