Connector for fluid lines, having at least one first connection area, at least one second connection area, a transition area and a fluid channel, the transition area being formed between the first connection area and the second connection area, the first connection area having a first fluid channel section, the transition area having a second fluid channel section and the second connection area having a third fluid channel section of the fluid channel, wherein the first connection area and the second connection area are arranged at an angle (α) to one another, wherein the angle (α) is less than 180°, wherein the central axes (M1, M2) of the first fluid channel section and of the third fluid channel section define a plane E, and wherein the second connection area has a substantially circular outer contour, wherein the third fluid channel section has a cross-section deviating from a circular shape at least in a first partial section, wherein a wall surrounding the third fluid channel section at least in the first partial section has at least one first circumferential area arranged outside the plane E with a pressure wall thickness, and wherein the wall surrounding the third fluid channel section, at least in the first partial section, has at least one second circumferential area intersecting the plane E with a support wall thickness which is greater than the pressure wall thickness, characterized in that the connector is formed in one piece from a plastic, in that the wall surrounding the third fluid channel section, at least in the first partial section, has at least two first circumferential areas with the pressure wall thickness arranged opposite one another and outside the plane E, and in that the wall surrounding the third fluid channel section, at least in the first partial section, has at least two second circumferential areas which are arranged opposite one another, intersect the plane E and have at least the supporting wall thickness. wherein the first connection area and the second connection area are arranged at an angle (α) to one another, wherein the angle (α) is less than 180°, wherein the central axes (M1, M2) of the first fluid channel section and of the third fluid channel section define a plane E, and wherein the second connection area has a substantially circular outer contour, wherein the third fluid channel section has a cross-section deviating from a circular shape at least in a first partial section, wherein a wall surrounding the third fluid channel section at least in the first partial section has at least one first circumferential area arranged outside the plane E with a pressure wall thickness, and wherein the wall surrounding the third fluid channel section, at least in the first partial section, has at least one second circumferential area intersecting the plane E with a support wall thickness which is greater than the pressure wall thickness, characterized in that the connector is formed in one piece from a plastic, in that the wall surrounding the third fluid channel section, at least in the first partial section, has at least two first circumferential areas with the pressure wall thickness arranged opposite one another and outside the plane E, and in that the wall surrounding the third fluid channel section, at least in the first partial section, has at least two second circumferential areas which are arranged opposite one another, intersect the plane E and have at least the supporting wall thickness.