A device for supplying an oxidant to a reaction reservoir containing a liquid metal which chemically reacts with the oxidant. A piston is slidable over a needle holder between two abutments. In the closed condition, a spring between the needle holder and the piston exerts a force on the needle holder to hold a needle in the discharge opening. An oxidant supply line opens into a cylinder on both sides of the piston via a 3-way valve for alternative connection.
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