Described is a container treatment device for the expansion of pre-forms into containers, having at least one blow moulding device for the introduction of a flowable medium under pressure into an inner space of the pre-form, and at least one stretching device for stretching the pre-form during an expansion procedure. The blow molding device has at least one blow molding nozzle piston and the stretching device has at least one stretch rod which is movable at least locally and at least for a time through a through opening of the blow molding nozzle piston in a translational manner and which is operatively connected to at least one portion of a stretch rod drive device, wherein at least one bearing element is arranged in the region of the through opening in order to guide the stretch rod.