This gasket for a sliding dome cover ensures a reliable seal between the movable cover and the container or collar. It is designed for use in systems with alternating vacuum (suction) and overpressure (pressure), such as tank containers, IBCs, or mobile tanks. The gasket is made of chemical- and temperature-resistant elastomers like EPDM, NBR, or FKM, depending on the media. It prevents leakage or ingress of liquids, gases, or vapors and ensures long-term sealing even under movement of the cover.