A tank filler tube includes a fill tube line which features, in the tank assembled state, an inlet end further from the tank, which is designed for temporary insertion of the fill nozzle into a closer-to-the-tank insertion region of the fill tube line, and with a closer-to-the-tank transit line end in the tank assembled state, which is designed for transit of liquid in a direction of the liquid transit line leading away from the inlet end, wherein the fill tube line is of multi-part design. At least one part of the ventilation line is for venting the gas displaced during a filling of a tank into the atmosphere. The fill tube line section featuring the transit line end extends into the insertion region further from the tank and is designed to accommodate at least one outlet end of a fill nozzle during a filling of a tank.

An example fluid container fill indicator system generates an alert in response to a change in pressure at the exhaust conduit or the fluid container. In some example, the change in pressure causes a reed or whistle type device to generate an audible alert. In some examples, the alert is a mechanical and/or electronic signal based on a change in position or orientation of a valve in response to the change in pressure.

An aircraft fuel tank venting and inerting arrangement comprising a fuel tank, a venting fluid flow path between the fuel tank and a venting outlet, an inerting fluid flow path for delivering inerting fluid to the fuel tank, at least part of the venting fluid flow path being provided by a fluid flow conduit and at least part of the inerting fluid flow path being provided by the fluid flow conduit. An aircraft comprising such an arrangement and a method of venting and inerting an aircraft fuel tank.