Multi-port valve, in particular cooling water valve for a motor vehicle, having: a housing (10, 14) having at least two connectors; a control element which for blocking at least one of the connectors is disposed so as to be rotatable in a recess of the housing; wherein an external contour of the control element has a compression portion which in at least one first position of the control element compresses a first seal which is disposed on a first one of the connectors; wherein the external contour of the control element has a decompression portion which has a smaller radius than the compression portion, and in at least one further position of the control element lies opposite the first seal such that the control element compresses the first seal less than in the first position; wherein the control element in the first position blocks the first connector; wherein the compression portion in at least one second position of the control element compresses a second seal which is disposed on a second one of the connectors; wherein at least one further one of the connectors is disposed between the first and the second connector (11, 12); and/or the control element in the second position of the control element compresses the second seal more than in the first position of the control element, and in the second position blocks and/or in the first position does not block the second connector; wherein the decompression portion in this further position of the control element supports the first seal in relation to the housing; wherein the control element in at least one position, by way of a slotted through passage of the control element, connects at least two of the connectors, and in at least one other position of the control element blocks at least one of these connectors, and the slot of the through passage is at least partially disposed in the decompression portion. a housing (10, 14) having at least two connectors; a control element which for blocking at least one of the connectors is disposed so as to be rotatable in a recess of the housing; wherein an external contour of the control element has a compression portion which in at least one first position of the control element compresses a first seal which is disposed on a first one of the connectors; wherein the external contour of the control element has a decompression portion which has a smaller radius than the compression portion, and in at least one further position of the control element lies opposite the first seal such that the control element compresses the first seal less than in the first position; wherein the control element in the first position blocks the first connector; wherein the compression portion in at least one second position of the control element compresses a second seal which is disposed on a second one of the connectors; wherein at least one further one of the connectors is disposed between the first and the second connector (11, 12); and/or the control element in the second position of the control element compresses the second seal more than in the first position of the control element, and in the second position blocks and/or in the first position does not block the second connector; wherein the decompression portion in this further position of the control element supports the first seal in relation to the housing; wherein the control element in at least one position, by way of a slotted through passage of the control element, connects at least two of the connectors, and in at least one other position of the control element blocks at least one of these connectors, and the slot of the through passage is at least partially disposed in the decompression portion.