The present invention relates to a dual flap device for connecting two receptacles (3, 5) so that there is no leakage into the surrounding environment (1, 1 '). And a; ( '20, 20' 10, 10) double flap device, two housing halves which can be releasably connected. Each of the housing half houses a; ( '22, 22' 12, 12) (10, 10 '20, 20') is, the flap that can be pivoted by a semi-shaft (14, 24). 'In the state of connection, half the housing (10, 10 this double flap device (1,1)'; 20, 20 ') and the flap (12, 12'; 22, 22 ') are respectively in contact with each other, each other It is pressed. Two flaps (12, 12 '; 22, 22') half shaft (14, 24) are integrated to form a common shaft having an axis of rotation (A) (15). Therefore, 'using both of the flaps (12, 12 locking device (40, 40'); a 22, 22 '), pivoting between an open position and a closed position by a common shaft (15) be able to. According to the present invention, first housing half (10, 10 ') is, at least on one side, locking device located in the extension of the axial direction of the respective half-shafts (14) (30, 30' comprises a) two so that the heavy flap device (1, 1 ') can be switched between an unlocked position and a locked position.