A device (10, 110, 210) to introduce and extract containers (11) with respect to a sterilization machine (100, 100a, 100b) in a direction of feed (X) comprises a container-loading plane (P, P, P") defining a movement path, and motorized linear guide rollers (12, 112, 212) disposed along the container-loading plane (P, P, P") and configured to move the containers (11) in a guided manner along the movement path in the direction of feed (X). The device (10, 110, 210) also comprises an auxiliary guide extension (13, 1 13, 213) connected to the container- loading plane (P, P, P") and mobile between a first retracted position, in which it is comprised within the bulk of the container-loading plane (P, P, P"), and a second operating position, in which it is at least partly protruding from the container-loading plane (P, P, P") in order to define an extension of said movement path.
