Filling pistol and method for filling an object essentially with nitrogen

A filling pistol for the filling under pressure of an object essentially with nitrogen, wherein the filling pistol comprises:

• i) a pistol housing with
• a) a handgrip portion having an air inlet which is connectable to an air source to supply air to the filling pistol therewith, and an operating element which is arranged to set the filling pistol to an operating condition in order to fill an object with nitrogen-rich gas;
• and
• b) a central housing part having an air outlet, and a flow path through the pistol housing from the air inlet in the handgrip portion to the air outlet in the central housing part;
• and
• ii) an exchangeable separation cartridge with an air inlet and a nitrogen outlet for separating nitrogen from an air stream, the cartridge including a cartridge housing enclosing a separation device provided downstream of the air inlet in the cartridge, the separation device having an inlet fluidly connected to the air outlet in the central housing part and an outlet fluidly connected to the nitrogen outlet in the separation cartridge, the nitrogen outlet in the separation cartridge being connectable to the object to be filled,
• wherein the separation cartridge is removably fixed to the central housing part, and provides essentially nitrogen-rich gas from the nitrogen outlet to the object when connected to the nitrogen outlet.