Consists of a rotatable top part with an integrated inner sleeve, a textured cylindrical outer surface, and a metric connection thread with a hexagonal collar. The protective sleeve screwed into the top part is securely held in place against vibration and tension in the connection and meets the requirements of VDE 0100 and 0113. The smooth inner surfaces ensure damage-free cable installation. In practice, the independent twisting capability of the top part is necessary when the connection is to be pre-assembled without a hose.