Application device and method for producing an application device

An application device for applying a viscous material to a substrate, comprising:

• an inner container having a dispensing opening for receiving the viscous material,
• an outer casing surrounding the inner container and having a substantially hollow-cylindrical neck region of an inner diameter D1 and an opening designed in the neck region, and
• an applicator connected to the outer casing,
• wherein the viscous material can be conveyed from the inner container into the applicator by pressure on the outer casing and the viscous material can be applied to a substrate by the applicator,
• wherein the application device has a ventilation device comprising an insert which is connected in an airtight manner to the inner container in a region of the dispensing opening and which is in a shape of a hollow cylinder and has an outer diameter D2, wherein the outer diameter D2 of the insert is smaller than the inner diameter D1 of the neck region of the outer casing, and wherein the insert has latching means on an outer side by which the insert is latched in an insert position within the neck region of the outer casing, wherein in this insert position, due to the different diameters D1 and D2, an annular gap is designed between the insert and the neck region of the outer casing, through which air can flow from outside into an intermediate space between the outer casing and the inner container and vice versa, and
• wherein a connection between the applicator and the outer casing is designed to be air-permeable and the applicator comprises a sealing means by which, in a use position of the applicator, an airtight and leak-proof sealing of an inner volume of the inner container with respect to the intermediate space between the outer casing and the inner container is provided.