Abstract: The invention relates to a closing and securing assembly for a bathtub and/or shower basin (2), having an entry region (3) which may be closed in a water-tight manner using a door (4) which optionally extends at least to standing height and which may be locked using a locking device (8), and having a discharge drain (9) having a closing mechanism which may be closed only in the locked state of the locking device (8). To provide the greatest possible safety while essentially completely avoiding electrical or electronic components, and which prevents bath water from escaping via the entry region (3) of the basin (2) when the door (4) is open or unlocked, and which allows the door (4) to be opened when the basin (2) is filled above the height of the entry region (3), a mechanical transfer arrangement (11) is provided for connecting a locking device (8) which operates in a strictly mechanical fashion to the closing mechanism, using a control system.