The invention relates to a single-use injector (4) and a dual-chamber system (99), wherein at least one first chamber (105) is part of a cylinder-piston unit (100) that can be received in the single-use injector, and wherein the second chamber (255) is part of a container (250) that can be at least temporarily closed by means of a stopper (257) and that is inserted in a container adapter (200) releaseably supported on the single-use injector. To this end, the plug comprises a plug hole. The container adapter comprises a transfer tube that is closed at first. When the container is inserted in the container adapter, the transfer tube (242) connects the interior of the cylinder-piston unit to the interior of the container.
