Transportable deflection device for deflecting a liquid flow of a liquid, which is impinged upon by a pressure of at least 5 bar, for introducing the liquid flow into a horizontal duct shaft opening, having at least one hollow body which is closed at least on one end side of the hollow body for the liquid flow, wherein the hollow body comprises at least one outlet opening on an outlet side of the hollow body opposite the end side for discharging the liquid flow in an outlet direction from the hollow body, wherein the hollow body comprises a) a plurality of inlet openings for entering the liquid flow into the hollow body in each case in an inlet direction which is substantially orthogonal to the outlet direction, and b) at least one disc-shaped closing wall at the end side, which is closed for the liquid flow and which is orthogonal to the outlet direction, and c) at least one cylindrical side wall connecting the end wall to an edge of the outlet opening, wherein the inlet openings are arranged in the side wall, characterized in that d) the hollow body comprises at least one diffusion element for reducing the flow velocity of the liquid flow entering through one of the inlet openings, d1) wherein the at least one diffusion element is in each case a diffusion section of the side wall, which diffusion section lies opposite each of the inlet openings and is closed for the liquid flow, such that the liquid flow, when the liquid flow impinges on the diffusion section, is reflected thereon and is thereby expanded and slowed down; and d2) wherein in each case one diffusion section lies opposite each inlet opening, such that even while liquid is introduced into the hollow body through a number of inlet openings, feed lines can be detached from the deflection device and/or connected thereto at further inlet openings without liquid having high pressure exiting from the inlet openings affected thereby, and e) the deflection device comprises at least one fixing device for fixing the deflection device to a duct shaft opening, e1) wherein the fixing device has a fixing section of a side wall of the hollow body, which can be inserted into the duct shaft opening, and e2) comprises an annular bearing device, which is fastened to the side wall between the inlet openings and the fixing section, for resting on an edge of the duct shaft opening, and f) the side wall comprises an additional opening for the liquid adjacent to the outlet opening, and g) the inlet openings each comprise a connection device for connecting at least one horizontal feed line for the liquid flow. a) a plurality of inlet openings for entering the liquid flow into the hollow body in each case in an inlet direction which is substantially orthogonal to the outlet direction, and b) at least one disc-shaped closing wall at the end side, which is closed for the liquid flow and which is orthogonal to the outlet direction, and c) at least one cylindrical side wall connecting the end wall to an edge of the outlet opening, wherein the inlet openings are arranged in the side wall, d) the hollow body comprises at least one diffusion element for reducing the flow velocity of the liquid flow entering through one of the inlet openings, d1) wherein the at least one diffusion element is in each case a diffusion section of the side wall, which diffusion section lies opposite each of the inlet openings and is closed for the liquid flow, such that the liquid flow, when the liquid flow impinges on the diffusion section, is reflected thereon and is thereby expanded and slowed down; and d2) wherein in each case one diffusion section lies opposite each inlet opening, such that even while liquid is introduced into the hollow body through a number of inlet openings, feed lines can be detached from the deflection device and/or connected thereto at further inlet openings without liquid having high pressure exiting from the inlet openings affected thereby, and d1) wherein the at least one diffusion element is in each case a diffusion section of the side wall, which diffusion section lies opposite each of the inlet openings and is closed for the liquid flow, such that the liquid flow, when the liquid flow impinges on the diffusion section, is reflected thereon and is thereby expanded and slowed down; and d2) wherein in each case one diffusion section lies opposite each inlet opening, such that even while liquid is introduced into the hollow body through a number of inlet openings, feed lines can be detached from the deflection device and/or connected thereto at further inlet openings without liquid having high pressure exiting from the inlet openings affected thereby, and e) the deflection device comprises at least one fixing device for fixing the deflection device to a duct shaft opening, e1) wherein the fixing device has a fixing section of a side wall of the hollow body, which can be inserted into the duct shaft opening, and e2) comprises an annular bearing device, which is fastened to the side wall between the inlet openings and the fixing section, for resting on an edge of the duct shaft opening, and e1) wherein the fixing device has a fixing section of a side wall of the hollow body, which can be inserted into the duct shaft opening, and e2) comprises an annular bearing device, which is fastened to the side wall between the inlet openings and the fixing section, for resting on an edge of the duct shaft opening, and f) the side wall comprises an additional opening for the liquid adjacent to the outlet opening, and g) the inlet openings each comprise a connection device for connecting at least one horizontal feed line for the liquid flow.