The Fire Extinguisher is a handheld item in Rodina that is used to put out fires on board the players ship. They contain a limited amount inside and are used by firing them towards the floor where the fire is.
It is best to have a few extinguishers in convenient locations on the ship to make sure that there is always one on hand to use in an emergency. The holders respawn extinguishers each time the game is reloaded.
Fires are caused by either taking damage from enemy fire, or from entering a planets atmosphere too steeply. See more information about fires.