Abstract: A filler device has a filler neck (23) and a closure cap (1) which has an engagement segment (4). The engagement segment (4) and filler neck (23) have complementary engagement elements (7, 8, 25, 26), for example in order to form a threaded or bayonet connection. They can be brought, by movement of the closure cap (1) with respect to the filler neck (23), from an initial position without engagement via an engagement path subsequent thereto into a final position, and vice versa. A locking device (13, 14) which prevents the closure cap (1) from falling off by itself is arranged and configured so that it generates an elevated resistance to movement in a specific movement region of the closure cap (1). The locking device (13, 14) is arranged in such a way that it is effective at a distance from the final position.

Abstract: A filler device has a filler neck (23) and a closure cap (1) which has an engagement segment (4). The engagement segment (4) and filler neck (23) have complementary engagement elements (7, 8, 25, 26), for example in order to form a threaded or bayonet connection. They can be brought, by movement of the closure cap (1) with respect to the filler neck (23), from an initial position without engagement via an engagement path subsequent thereto into a final position, and vice versa. A locking device (13, 14) which prevents the closure cap (1) from falling off by itself is arranged and configured so that it generates an elevated resistance to movement in a specific movement region of the closure cap (1). The locking device (13, 14) is arranged in such a way that it is effective at a distance from the final position.