An object is to provide a drying device of a printing press that is capable of securely storing the integrated values of the irradiation times of LEDs and notifying the operator of the replacement timing of the LEDs. The sounding piece, which is made of a material sufficiently stiff as to emit a sound when strummed, has a plurality of corrugations. The adapter includes air vents which facilitate the escape of air in the bag-in-box while it is being displaced with other contents from the supply line. A third section defines a lumen and is located between the first and second sections. The apparatus is characterized by the hood which includes a wall and a baffle. so as to improve heat efficiency, thus facilitating temperature control in the furnace, reducing wearing of the furnace body and facilitating repair of the furnace.