Patent ID: 6889863

Claim:
Compensation reservoir comprising a connecting socket and a cover having a bottom and a circumferential collar for attachment to the connecting socket by thread means, wherein the attachment is configured for air interchange between the air of the ambient atmosphere and an inner space of the reservoir which inner space is limited by the bottom, and air interchange being provided by an integrated duct that interconnects a radial outward section of the inner space and an opening within the cover, wherein lateral walls of the duct are casted in one piece from the material of the cover, wherein the duct is provided by a cylindrical opening which extends from the radial outward section of the inner space in a radial inward direction and reaches at least until a central axis of the cover, and wherein the cylindrical opening reaches until an outside surface of the circumferential collar, and the outlet of the cylindrical opening is closed by a closing element or by way of hot shaping, welding, or cementing a closing element that is integrally connected to the cover.