A device for removing and replacing containers from and on a conveyor line includes a first lateral guide wall; a second lateral guide wall; and a rotating disc provided with at least a seating The rotating disc is arranged between the first lateral guide wall and the second lateral guide wall for removing a container to be treated from the conveyor line and for replacing a treated container on the conveyor line The device further includes a first guide member mobile between a first retracted position and a first advanced position and a second guide member mobile between a second retracted position and a second advanced position The rotating disc, the first guide member and the second guide member are phase-activatable such as to transfer containers from and onto the conveyor line.