A self retaining bottle stopper fixture assembly configured to seal and opening of a bottle and to preserve an oxygen sensitive substance under pressure therein and/or for sealing the bottle for transport or horizontal storage. The assembly generally includes an anchor member for inserting onto a neck of a bottle or other container, and a retainer member for covering the stopper and coupling to the anchor member to secure the stopper to the bottle.

The invention refers to a device to create a hermetic seal for large openings in equipment subject to low pressure. According to the invention it is characterized by at least one sealing cover being provided, which is pressed onto the side wall of the equipment by means of bolts, where the bolts are welded to a strip attached to the side wall at the edge of the opening in the equipment. This provides a good, low-cost and hermetic seal.