FIELD: mechanical engineering. SUBSTANCE: proposed device is designed for introduction of fluid medium into liquid when opening a container. First container filled with liquid is provided with inlet hole closed by split cover. Second container is arranged in first container at inlet hole of first container. Second container is filled with fluid medium and is designed for discharging fluid medium into first container for contact with liquid when cover of first container is released. Device provides mixing of catalyst or reagent with liquid without errors in metering out required dose. EFFECT: enhanced reliability of operation. 11 cl, 5 dwg
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