Device for blow molding plastic containers, comprising an openable and closable blow mold for the conversion of tempered plastic preforms, whereby an inner blow pressure is applied to the plastic containers, whereby the blow mold contains at least two shell like blow mold pieces which are arranged interchangeably at a blow mold carrier (32, 18) and wherein each of the blow mold pieces contains cooling fluid pipes as conducts for a cooling fluid extending therein to temper the blow mold during and / or after blow molding of the plastic containers, whereby the cooling fluid pipes in the blow mold are connected to a central cooling fluid supply of the device for blow molding, and whereby a coupling module (20, 40) is arranged between the central cooling fluid supply and the cooling fluid pipes extending in the blow mold pieces, characterized in that the coupling module (20, 40) comprises a firmly fixed coupling cassette with movable elements and is associated spatially and / or structurally with the blow mold carrier (32, 18), wherein: - the coupling cassette comprises two elements which are separated from one another and which are respectively slidable and firmly integrated, - via the coupling cassette, the elements will experience a latching position and are releasable again by means of a push button as an actuating element, - a coupling element on one side at the ends of the elements can be brought up to a corresponding counter element and the opposite end of the elements can be connected to the supply line for the cooling fluid, - the elements have a bolt arranged 90 ° relative to the displacement direction, which bolt is used as an actuating means for pushing, - the displaceable elements, which are subjected to a mechanical prestress, are brought into the latching position, a connection is effected and the coolant circuit is thereby closed, and - a disconnection of the connection is achieved by releasing the latching position by pressing the push button, whereby the elements are automatically pushed into an open position by the prestress of the pressure spring, and the coolant circuit is thereby interrupted. - the coupling cassette comprises two elements which are separated from one another and which are respectively slidable and firmly integrated, - via the coupling cassette, the elements will experience a latching position and are releasable again by means of a push button as an actuating element, - a coupling element on one side at the ends of the elements can be brought up to a corresponding counter element and the opposite end of the elements can be connected to the supply line for the cooling fluid, - the elements have a bolt arranged 90 ° relative to the displacement direction, which bolt is used as an actuating means for pushing, - the displaceable elements, which are subjected to a mechanical prestress, are brought into the latching position, a connection is effected and the coolant circuit is thereby closed, and - a disconnection of the connection is achieved by releasing the latching position by pressing the push button, whereby the elements are automatically pushed into an open position by the prestress of the pressure spring, and the coolant circuit is thereby interrupted.