A pressure vessel, and a method of manufacturing a pressure vessel. The pressure vessel includes: a base layer formed from a polymer material; a reinforcement layer formed from a fibre reinforced polymer material wherein the polymer is a heat curable polymer; and an impermeable barrier layer, the barrier layer located between the base layer and the reinforcement layer; wherein the heat curable polymer has been cured at a first temperature, and wherein the barrier layer is formed from a material that is in a softened state at the first temperature.

A hydrogen supply device including at least one hydrogen tank, at least one hydrogen circuit and at least one upstream container joined to the hydrogen tank, as well as at least one removable downstream container. The upstream and downstream containers are configured to occupy an assembled state, in which the upstream and downstream containers are connected, and a detached state in which the upstream and downstream containers are not joined. The hydrogen circuit has an upstream segment positioned in the upstream container, a downstream segment positioned in the downstream container, as well as a first connection system which connects the upstream and downstream segments when the upstream and downstream containers are in the assembled state. Thus, each downstream container may be uninstalled and removed from the aircraft without it being necessary to uninstall the hydrogen tank.