Abstract: A device for assembling a shield containing at least one hole onto a tank, a shield intended for such a device, an assembly method using the device, and a tank including the device. The device includes a base configured to be firmly attached to a wall of the tank, and a head used for fixing the shield, the head including a groove whose lower and upper lateral surfaces intersect an axis of the device substantially normal to the wall of the tank, the groove being used such that the edge of the hole in the shield slides into the groove. The device also includes a non-return stub that emerges from the outer surface of the device and prevents detachment of the shield from the tank.