Fluid diverting device for an apparatus for extracorporeal treatment of blood, wherein the apparatus comprises: a blood treatment unit ; an extracorporeal blood circuit coupled to the blood treatment unit and comprising a blood withdrawal line and a blood return line connectable to a vascular access of a patient (P); a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit; wherein the fluid diverting device is configured to be placed in-line between a blood set of the apparatus and the vascular access of the patient (P) and comprises: - a substantially H-shaped conduits assembly comprising a withdrawal conduit , a return conduit and at least one bridging conduit connecting or configured to connect the withdrawal conduit to the return conduit ; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line , wherein the return conduit is connected or connectable upstream and downstream to the return line ; - a plurality of valves or distributors operating on the withdrawal conduit , on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient (P); characterized in that at least one of the plurality of valves is a rotating clamp, wherein the rotating clamp comprises a rotating body and an abutment element ; and in that at least two valves of the plurality of valves comprise one common rotating body and respective abutment elements . a blood treatment unit ; an extracorporeal blood circuit coupled to the blood treatment unit and comprising a blood withdrawal line and a blood return line connectable to a vascular access of a patient (P); a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit; wherein the fluid diverting device is configured to be placed in-line between a blood set of the apparatus and the vascular access of the patient (P) and comprises: - a substantially H-shaped conduits assembly comprising a withdrawal conduit , a return conduit and at least one bridging conduit connecting or configured to connect the withdrawal conduit to the return conduit ; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line , wherein the return conduit is connected or connectable upstream and downstream to the return line ; - a plurality of valves or distributors operating on the withdrawal conduit , on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient (P); - a substantially H-shaped conduits assembly comprising a withdrawal conduit , a return conduit and at least one bridging conduit connecting or configured to connect the withdrawal conduit to the return conduit ; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line , wherein the return conduit is connected or connectable upstream and downstream to the return line ; - a plurality of valves or distributors operating on the withdrawal conduit , on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient (P); characterized in that at least one of the plurality of valves is a rotating clamp, wherein the rotating clamp comprises a rotating body and an abutment element ; and in that at least two valves of the plurality of valves comprise one common rotating body and respective abutment elements . <EOS>