A cooling device comprising - one or more cabins wherein items to be cooled are stored, - a door for closing the cabin and providing access of the user to the items emplaced in the cabin, - a discharge duct having an inlet nozzle extending into the cabin, into which the water formed during a defrosting process is delivered from the cabin and through which air is taken into the cabin upon imbalance of pressure, - an outlet nozzle extending to the ambient surroundings by means of which the water formed during the defrosting process is discharged out of the cabin and - an opening situated between the inlet nozzle and the outlet nozzle for preventing the imbalance of pressure, extending to the ambient surroundings through which air is taken into the cabin, characterized by a valve - that divides the discharge duct into two portions such that the inlet nozzle is on one side of the valve, with the outlet nozzle and the opening being on the other side of the valve when there is no passage of air or water, - that closes the discharge duct such that air and/or water cannot pass through in the position of balance, - that, when pressure imbalance is created between the cabin and the ambient surroundings, moves such that the inlet nozzle and the opening are on one side of the valve, providing to balance the inner pressure of the cabin by allowing the inflow of air between the opening and the inlet nozzle, - that, during the discharge of the water in the cabin, moves such that the inlet nozzle and the outlet nozzle are on one side of the valve providing to discharge the water out of the cabin by allowing the passage of water between the inlet nozzle and the outlet nozzle. - one or more cabins wherein items to be cooled are stored, - a door for closing the cabin and providing access of the user to the items emplaced in the cabin, - a discharge duct having an inlet nozzle extending into the cabin, into which the water formed during a defrosting process is delivered from the cabin and through which air is taken into the cabin upon imbalance of pressure, - an outlet nozzle extending to the ambient surroundings by means of which the water formed during the defrosting process is discharged out of the cabin and - an opening situated between the inlet nozzle and the outlet nozzle for preventing the imbalance of pressure, extending to the ambient surroundings through which air is taken into the cabin, - that divides the discharge duct into two portions such that the inlet nozzle is on one side of the valve, with the outlet nozzle and the opening being on the other side of the valve when there is no passage of air or water, - that closes the discharge duct such that air and/or water cannot pass through in the position of balance, - that, when pressure imbalance is created between the cabin and the ambient surroundings, moves such that the inlet nozzle and the opening are on one side of the valve, providing to balance the inner pressure of the cabin by allowing the inflow of air between the opening and the inlet nozzle, - that, during the discharge of the water in the cabin, moves such that the inlet nozzle and the outlet nozzle are on one side of the valve providing to discharge the water out of the cabin by allowing the passage of water between the inlet nozzle and the outlet nozzle.