Abstract: A closing system, of a hookah (01), has a first closing element (13), which can be attached to a water base (02) of the hookah (01), and a second closing element (16), which includes at least one connecting opening for at least one hookah hose (12) and at least one continuous opening (22) for a connection permeable to air between the water base (02) and a hookah stem (07), arranged directly or indirectly at a second closing element (16). The second closing element (16) has an essentially cylindrical portion (18), which can be inserted into a recess in the first closing element (13) and is complementary in shape and function to the cylindrical portion (18). The cylindrical portion (18) includes an indentation (31) in an area of an outer wall, a displaceable locking element (35) provided in an inner wall of the recess being detachably engageable in the indentation (31).