Filtration device for use in a water extraction module, and suitable for purifying liquid water from a water tank intended for a combustion chamber of a vehicle, the filtration device including: i) an outer component which has at least one inlet through which the liquid water from the water tank can reach a filtration region, a top end and a side wall which extends between the top end and the inlet; ii) a filtering medium surrounded by the outer component extending into the filtration region below the upper end; iii) a filtered liquid water discharge outlet, the outlet being formed in a fluidic connection fitting, the filtering medium being interposed between the at least one inlet and the outlet; iv) an angled track for the circulation of filtered water including a channel for upward circulation of water filtered by the filtering medium and an outlet channel delimited by the fluidic connection fitting; and v) a non-return valve mounted on the outer component and provided in a barrier part including the upper end and the side wall; the device for purifying liquid water from the water tank in an assembly configuration in which said channel of the angled track provides an upward circulation of water to the outlet channel, the outer component being provided with a lower end opposite the upper end, wherein the barrier portion of the device extends above the inlet in the assembly configuration, to enable access to the filtration region above said inlet to be prevented, wherein said filtering medium, fixed to the outer component and/or held in an internal volume of the outer component, by extending into the filtration region, under the upper end in the assembly configuration, is surrounded by the side wall belonging to the barrier part, the filtering medium being interposed between said inlet and outlet; and wherein a check valve is provided in the non-return valve, wherein at least one vent formed in the barrier part: - is closed by default by the check valve of the non-return valve, - defines an access between the filtration region and a zone external to the filtration device without passing through said inlet, for an offset position and/or deformed position of the check valve obtained when the check valve is subjected to overpressure on the side of the filtration region, the valve of the filtration device allowing a degassing path to be formed when air circulates upwards along the barrier portion or is pressurised in the filtering region. i) an outer component which has at least one inlet through which the liquid water from the water tank can reach a filtration region, a top end and a side wall which extends between the top end and the inlet; ii) a filtering medium surrounded by the outer component extending into the filtration region below the upper end; iii) a filtered liquid water discharge outlet, the outlet being formed in a fluidic connection fitting, the filtering medium being interposed between the at least one inlet and the outlet; iv) an angled track for the circulation of filtered water including a channel for upward circulation of water filtered by the filtering medium and an outlet channel delimited by the fluidic connection fitting; and v) a non-return valve mounted on the outer component and provided in a barrier part including the upper end and the side wall; the device for purifying liquid water from the water tank in an assembly configuration in which said channel of the angled track provides an upward circulation of water to the outlet channel, the outer component being provided with a lower end opposite the upper end, wherein the barrier portion of the device extends above the inlet in the assembly configuration, to enable access to the filtration region above said inlet to be prevented, wherein said filtering medium, fixed to the outer component and/or held in an internal volume of the outer component, by extending into the filtration region, under the upper end in the assembly configuration, is surrounded by the side wall belonging to the barrier part, the filtering medium being interposed between said inlet and outlet; and wherein a check valve is provided in the non-return valve, wherein at least one vent formed in the barrier part: - is closed by default by the check valve of the non-return valve, - defines an access between the filtration region and a zone external to the filtration device without passing through said inlet, for an offset position and/or deformed position of the check valve obtained when the check valve is subjected to overpressure on the side of the filtration region, - is closed by default by the check valve of the non-return valve, - defines an access between the filtration region and a zone external to the filtration device without passing through said inlet, for an offset position and/or deformed position of the check valve obtained when the check valve is subjected to overpressure on the side of the filtration region, the valve of the filtration device allowing a degassing path to be formed when air circulates upwards along the barrier portion or is pressurised in the filtering region.