An electromechanical actuator for a concealment device, the electromechanical actuator comprising at least: - an electric motor, - a control unit, the control unit being configured to control the electric motor, - a casing, the electric motor and the control unit being housed inside the casing, - an electrical supply cable, the electrical supply cable passing through a wall of the casing and being electrically connected to the control unit, the wall of the casing having an inner side, facing the inside of the casing, and an outer side, facing the outside of the casing, the inner side being opposite the outer side, and - a retaining component, characterised in that the electromechanical actuator further comprises: - an end piece, the end piece being fixed to the electrical supply cable, in that the casing comprises at least: - a housing of non-circular cross-section, the non-circular cross-section housing being formed in the wall of the casing, and - a through opening, the through opening being formed in the wall of the casing, in that the end piece comprises at least: - a non-circular-section portion, the non-circular-section portion of the end piece being engaged in the non-circular-section housing formed in the wall of the casing, and - a barrel, the barrel being engaged in the through opening of the wall of the casing, a part of the barrel extending from the through opening onto the inner side of the wall of the casing, the retaining component being mounted on the part of the barrel, and in that the barrel carries at least one sealing lip, the or each sealing lip being in contact with a surface, delimiting the through opening formed in the wall of the casing. the electromechanical actuator comprising at least: - an electric motor, - a control unit, the control unit being configured to control the electric motor, - a casing, the electric motor and the control unit being housed inside the casing, - an electrical supply cable, the electrical supply cable passing through a wall of the casing and being electrically connected to the control unit, the wall of the casing having an inner side, facing the inside of the casing, and an outer side, facing the outside of the casing, the inner side being opposite the outer side, and - a retaining component, - an electric motor, - a control unit, the control unit being configured to control the electric motor, - a casing, the electric motor and the control unit being housed inside the casing, - an electrical supply cable, the electrical supply cable passing through a wall of the casing and being electrically connected to the control unit, the wall of the casing having an inner side, facing the inside of the casing, and an outer side, facing the outside of the casing, the inner side being opposite the outer side, and - a retaining component, characterised in that the electromechanical actuator further comprises: - an end piece, the end piece being fixed to the electrical supply cable, - an end piece, the end piece being fixed to the electrical supply cable, in that the casing comprises at least: - a housing of non-circular cross-section, the non-circular cross-section housing being formed in the wall of the casing, and - a through opening, the through opening being formed in the wall of the casing, - a housing of non-circular cross-section, the non-circular cross-section housing being formed in the wall of the casing, and - a through opening, the through opening being formed in the wall of the casing, in that the end piece comprises at least: - a non-circular-section portion, the non-circular-section portion of the end piece being engaged in the non-circular-section housing formed in the wall of the casing, and - a barrel, the barrel being engaged in the through opening of the wall of the casing, a part of the barrel extending from the through opening onto the inner side of the wall of the casing, the retaining component being mounted on the part of the barrel, - a non-circular-section portion, the non-circular-section portion of the end piece being engaged in the non-circular-section housing formed in the wall of the casing, and - a barrel, the barrel being engaged in the through opening of the wall of the casing, a part of the barrel extending from the through opening onto the inner side of the wall of the casing, the retaining component being mounted on the part of the barrel, and in that the barrel carries at least one sealing lip, the or each sealing lip being in contact with a surface, delimiting the through opening formed in the wall of the casing.