Nozzle end-piece for filler nozzle of fluid tank

The gas outlet can be closed by a check valve (4). The movement of the sealing cap (3) is activated as a result of inserting the molding spout of the check valve. The connecting piece closure further comprises an exhaust air channel (7) which has at least one curved segment for forming the labyrinth seal. The curved segment is arranged between the gas collecting chamber (6) and the exhaust air channel.