The work loading of a gunning operator is considerably reduced by the use of gunning manipulator. The operator is no longer exposed to the radiation heat. The gunning material can be applied more targeted and the inside gunning of a snorkel is possible only by using a gunning manipulator. The gunning manipulator is placed on a service car and is driven under the snorkel. Depending on the design it is provided with 1 or 2 gunning lances.