Control device for the protection of metallic components and motor vehicle bodies by application of a corrosion inhibiter comprising - a tubular supply line for supplying the corrosion inhibiter to at least one control valve with a switching pipe which passes diametrically through the wall of the supply line, - a switching shaft disposed rotatably in the switching pipe which is provided with a coaxial cavity, - a drive for twisting the switching shaft, which is connected in a torque-proof manner to one end of the switching shaft, - a lead portion disposed in the interior of the supply line for each control valve, which in at least two angular positions of the switching shaft relative to the switching pipe brings the cavity in the interior of the switching shaft in conducting communication with the interior of the supply line for the corrosion inhibiter, - a first outlet opening disposed outside the supply line in the switching pipe at which a supply line for the corrosion inhibitor can be connected to a flood point, characterized in that - the first outlet opening and at least one further outlet opening outside the supply line are disposed radially in the switching pipe, - at least one outlet passage (17a, b) outside the supply line is disposed radially in the switching shaft and opens in the interior of the cavity, - wherein each outlet passage (17a, b) and the outlet openings (16a, b) are disposed in such a manner with respect to one another that in the at least two angular positions of the switching shaft relative to the switching pipe always only one outlet opening (16a, b) is in conducting communication for the corrosion inhibiter via the cavity and the lead portion with the interior of the supply line. - a tubular supply line for supplying the corrosion inhibiter to at least one control valve with a switching pipe which passes diametrically through the wall of the supply line, - a switching shaft disposed rotatably in the switching pipe which is provided with a coaxial cavity, - a drive for twisting the switching shaft, which is connected in a torque-proof manner to one end of the switching shaft, - a lead portion disposed in the interior of the supply line for each control valve, which in at least two angular positions of the switching shaft relative to the switching pipe brings the cavity in the interior of the switching shaft in conducting communication with the interior of the supply line for the corrosion inhibiter, - a first outlet opening disposed outside the supply line in the switching pipe at which a supply line for the corrosion inhibitor can be connected to a flood point, characterized in that - the first outlet opening and at least one further outlet opening outside the supply line are disposed radially in the switching pipe, - at least one outlet passage (17a, b) outside the supply line is disposed radially in the switching shaft and opens in the interior of the cavity, - wherein each outlet passage (17a, b) and the outlet openings (16a, b) are disposed in such a manner with respect to one another that in the at least two angular positions of the switching shaft relative to the switching pipe always only one outlet opening (16a, b) is in conducting communication for the corrosion inhibiter via the cavity and the lead portion with the interior of the supply line.