Cap-free closable filler neck end

The end has a flap safety device formed by a locking groove (5) in which a section of an edge of a spring-loaded upper closure flap (3) is engaged. The flap safety device is detachable by spatial displacement of the flap by driving out an edge from the groove. A lower region of the groove is formed from a pivoting lock (7) that is displaceable against force of a spring. The lock is displaceable by the closure flap. The flap springs back the edge of the closure flap for closing the locking groove according to resting of the flap against an upper groove edge.