A drainage fitting (1) for a cistern, including a valve body (2) with a sealing element (4), which cooperates with a valve seat (3), and a float (5), wherein the valve body (2) is movable with the sealing element (4) from the valve seat (3) along a movement axis (B) from a rest position into a flushing position and from the flushing position into the rest position. Furthermore the drainage fitting comprises a full and a part volume control unit which onto the valve body.