The Stihl engine casing (code 1140-020-3004) is an original spare part for Stihl MS 311, MS 391 chainsaws. Includes valve, 2.6x8 slotted cylindrical nail, 4 pins, 4x1.5 o-ring, wind weir, hose, M8 collar screw, M8 collar screw, tank cap, 25x3.5 MN o-ring