Abstract: The invention relates to a container of a biogas system, comprising a component which may be removed from the container, for example an agitator for mixing substrate located in the container, a removal opening, as well as a removal device with which the component may be removed at least partially through the removal opening out of the container, for example for maintenance purposes, the removal device comprising a flexible hose which may be fastened with its first end to the removal opening, such that between the container interior and the hose interior a connection which is fluid-tight relative to the outside is present, through which the component may be at least partially guided into the hose, the removal device comprising a closure device by which the hose may be closed in a fluid-tight manner in the state fastened to the removal opening, and the removal device comprising a constricting device by which the hose may be constricted by reducing the hose cross section in the state fastened to the removal open