NOVELTY - Auxiliary device comprises biogas pipe (1), feeding reservoir (3), connector (2) for connecting pipe to the reservoir, cylinder head (5), tubes (4) that are positioned vertically, where lower ends of tubes are attached at the top of the reservoir and the upper ends are coupled in the lower part of the cylinder head. The connector is provided for coupling the tube to cylinder head. The materials for the components are rigid polyvinyl chloride, high density polyethylene, or other materials that exhibit a low coefficient of methane diffusivity. The diameter of tubes is 1-5 inches.    USE - Auxiliary device for removing residual moisture content of the biogas by anaerobic digestion of organic residues used as fuel in vehicles and related engines (claimed).    ADVANTAGE - The auxiliary device ensures the continuous removal of condensate and maintains biogas pressure inside the device.    DETAILED DESCRIPTION - Auxiliary device comprises biogas pipe (1), feeding reservoir (3), connector (2) for connecting pipe to the reservoir, cylinder head (5), tubes (4) that are positioned vertically, where lower ends of tubes are attached at the top of the reservoir and the upper ends are coupled in the lower part of the cylinder head. The connector is provided for coupling the tube to cylinder head. The materials for the components are rigid polyvinyl chloride, high density polyethylene, or other materials that exhibit a low coefficient of methane diffusivity. The diameter of tubes is 1-5 inches. The length of the tubes is calculated according to the height of the engine cooling system. The length of the reservoir and cylinder head is calculated according to the width of engine cooling system. The thickness of the reservoir and cylinder head is calculated according to the diameter of the tubes.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an auxiliary device.    Biogas pipe (1)    Connector (2)    Feeding reservoir (3)    Tubes (4)    Cylinder head (5)