DEVICE FOR CONTROLLING THE FLUID EXCHANGE BETWEEN AT LEAST TWO CUSHION CHAMBERS OF A CUSHION, AND SEAT CUSHION AND CHAIR HAVING SUCH A CUSHION

The invention provides a device (2) for controlling the fluid exchange between at least two cushion chambers (100a, 100b, 100c, 100d) of a cushion (1), wherein there is provided to all the cushion chambers (100a, 100b, 100c, 100d) in each case at least one hose line (44) for connection to the respective cushion chamber (100a, 100b, 100c, 100d), and wherein a passage chamber (50) is provided in which the hose lines (44) are brought together. The cushion chambers (100a, 100b, 100c, 100d) can thus be brought into fluid communication with one another via the passage chamber (50). A base (12) for the passage chamber (50) and a pressure body (16) which is seated on the passage chamber (50) are provided, wherein the pressure body (16) is displaceable relative to the base (12) in such a way that the pressure chamber (50) can be variably compressed.