A manifold having a circular cross-section with a deflection angle of 180 degrees for a tube bundle heat exchanger for high product pressures, comprising first and second flanges (2; 3) at each inlet and outlet of the manifold, • wherein the manifold consists of two manifold halves (1.1, 1.2), each in one piece, • each manifold half (1.1, 1.2) having a connection point at its end remote from the flange (2, 3), • wherein the profile of the passage cross-sections of each manifold half (1.1, 1.2) is formed by rotationally symmetrical passage openings of which at least one extends on the one side from the flange (2, 3) and at least one on the other side from the associated connecting point in a respective coaxial arrangement on axes of rotation (X1.1, Y1.1; XI.2, Y1.2), • wherein the first and second axes of rotation (X1.1, Y1.1) of the passage openings of the first manifold half (1.1) and the third and fourth axes of rotation (XI.2, Y1.2) of the passage openings of the second manifold half (1.2) extend in a common plane which represents a meridian plane for each flange (2, 3), • wherein the first and second rotational axes (X1.1, Y1.2) intersect at a first intersection and the third and fourth rotational axes (XI.2, Y1.2) intersect at a second intersection, • wherein the first intersection point on the first axis of rotation (X1.1) is assigned a penetrating first opening and on the second axis of rotation (Y1.1) a penetrating second opening, which penetrate each other on one side, and • wherein a penetrating third opening is associated with the second intersection point on the third axis of rotation (XI.2) and a penetrating fourth opening is associated with the fourth axis of rotation (Y1.2), each opening penetrating one another on one side characterized • in that the manifold halves (1.1, 1.2) are produced from round material and from the solid by machining, • in that the manifold halves (1.1, 1.2) are connected to one another in a material-locking manner at the associated connection point, and • -in that the first to fourth passage openings (5, 6; 7, 8) are each frustoconical in shape and their respective taper is oriented towards the respectively associated first or second intersection point (P1, P2). • wherein the manifold consists of two manifold halves (1.1, 1.2), each in one piece, • each manifold half (1.1, 1.2) having a connection point at its end remote from the flange (2, 3), • wherein the profile of the passage cross-sections of each manifold half (1.1, 1.2) is formed by rotationally symmetrical passage openings of which at least one extends on the one side from the flange (2, 3) and at least one on the other side from the associated connecting point in a respective coaxial arrangement on axes of rotation (X1.1, Y1.1; XI.2, Y1.2), • wherein the first and second axes of rotation (X1.1, Y1.1) of the passage openings of the first manifold half (1.1) and the third and fourth axes of rotation (XI.2, Y1.2) of the passage openings of the second manifold half (1.2) extend in a common plane which represents a meridian plane for each flange (2, 3), • wherein the first and second rotational axes (X1.1, Y1.2) intersect at a first intersection and the third and fourth rotational axes (XI.2, Y1.2) intersect at a second intersection, • wherein the first intersection point on the first axis of rotation (X1.1) is assigned a penetrating first opening and on the second axis of rotation (Y1.1) a penetrating second opening, which penetrate each other on one side, and • wherein a penetrating third opening is associated with the second intersection point on the third axis of rotation (XI.2) and a penetrating fourth opening is associated with the fourth axis of rotation (Y1.2), each opening penetrating one another on one side characterized • in that the manifold halves (1.1, 1.2) are produced from round material and from the solid by machining, • in that the manifold halves (1.1, 1.2) are connected to one another in a material-locking manner at the associated connection point, and • -in that the first to fourth passage openings (5, 6; 7, 8) are each frustoconical in shape and their respective taper is oriented towards the respectively associated first or second intersection point (P1, P2).