The invention describes a hearing device with a BTE (Behind-The-Ear) unit and an air filled tube. The BTE unit comprises a power source, a microphone, an amplifier, and a receiver and is configured to be mounted behind or on the ear of a user. The air filled tube as a proximal end and a distal end. The proximal end of the air filled tube is connected to the receiver of the BTE unit and a flexible sealing part is provided at the distal end. The flexible sealing part comprises a core hole permeable for sound transmitted from the air filled tube through a core pathway. The air filled tube is further configured to be arranged in a user's ear canal to transmit sound generated by the BTE unit to a tympanic membrane of the user. The flexible sealing part is arranged in a bony portion of the user's ear canal when in use. The diameter of the flexible sealing part is at least as large as the diameter of the bony portion of the ear canal of a user to close the ear canal.