Extinguishing gun (1) with a barrel (4, 5) for the discharge of the extinguishing agent via an outlet nozzle (6) and with a valve control (8) with a push-off valve (12) for the outlet of an extinguishing agent, this via a feed line (7) into the Extinguishing gun (1), characterized in that the barrel (4, 5) is encased on the inlet side by a prechamber (2), the feed lines (7a, b, c) for the extinguishing agent being in the form of water in the prechamber (2) , Air and chemicals flow out and the feed lines (7a, b, c) can be opened one after the other by actuating the pressure tap (12), always starting with water and the prechamber (2) connected to the inside of the barrel (4, 5) or is connectable.
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