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A fluid vessel, in particular a liquid vessel, in particular for an exhaust-gas purification fluid for the treatment of exhaust gas of an internal combustion engine, in particular for an aqueous urea solution, wherein the fluid vessel has a filler pipe which is connected in fluid-conducting fashion

A fluid vessel, in particular a liquid vessel, in particular for an exhaust-gas purification fluid for the treatment of exhaust gas of an internal combustion engine, in particular for an aqueous urea solution, wherein the fluid vessel has a filler pipe which is connected in fluid-conducting fashion to an interior of the fluid vessel and which, at an end remote from the interior of the fluid vessel, has a filler head and is closed off by means of a removable tank cover, wherein the fluid vessel and the filler pipe are designed and arranged such that, when the fluid vessel is in an installed position, a geodetically highest point of the fluid vessel is situated geodetically lower than the filler head. One ventilation device is arranged in the tank cover and at the geodetically highest point, when the fluid vessel is in the installed position, of the fluid vessel.

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1. A fluid vessel for an exhaust-gas purification fluid for the treatment of exhaust gas of an internal combustion engine for an aqueous urea solution, the fluid vessel comprising: a filler pipe which is connected in fluid-conducting fashion to an interior of the fluid vessel and which, at an end av

1. A fluid vessel for an exhaust-gas purification fluid for the treatment of exhaust gas of an internal combustion engine for an aqueous urea solution, the fluid vessel comprising: a filler pipe which is connected in fluid-conducting fashion to an interior of the fluid vessel and which, at an end averted from an interior of the fluid vessel, has a filler head;a detachable tank cap arranged to close the filler pipe, wherein the fluid vessel and the filler pipe are arranged such that, in an installed position of the fluid vessel, a geodetically highest point of the fluid vessel lies geodetically lower than the filler head, andfirst and second deaeration devices, wherein, the first deaeration device is arranged in the tank cap and the second deaeration device is arranged at the point which is the geodetically highest point of the fluid vessel when the fluid vessel is in the installed position,wherein pressure equalization resulting from operation of the first and second deaeration devices to aerate and/or deaerate the interior of the fluid vessel is generated to counteract a negative pressure generated in the vessel interior during extraction of fluid from the fluid vessel. 2. The fluid vessel of claim 1, further comprising an immersion pipe that connects the interior of the fluid vessel to the filler head in fluid-conducting fashion, wherein the immersion pipe, at an end facing toward the interior of the fluid vessel, projects into the interior of the fluid vessel. 3. The fluid vessel of claim 2, wherein the immersion pipe is connected in fluid-conducting fashion to the filler head via a deaeration line, wherein a bubble section is arranged in the deaeration line. 4. The fluid vessel of claim 1, further comprising a check valve arranged and formed in the filler pipe such that said check valve permits a fluid flow in the direction of the interior of the fluid vessel and blocks a fluid flow in the opposite direction. 5. The fluid vessel of claim 4, wherein, when the fluid vessel is in the installed position, the check valve is arranged geodetically higher than the geodetically highest point of the fluid vessel. 6. The fluid vessel of claim 1, wherein the first deaeration device in the tank cap and/or the second deaeration device at the geodetically highest point of the fluid vessel is/are implemented as a PTFE (polytetrafluoroethylene) diaphragm. 7. The fluid vessel of claim 1, wherein the second deaeration device at the geodetically highest point of the fluid vessel is implemented as a throttle bore, wherein a fluid-conducting connection is formed from the throttle bore to the filler head.