FIELD: sealing vessels. SUBSTANCE: device consists of plug and face diaphragm coupled with the plug. The plug has hollow screw cylinder for engaging with the neck thread, flange arranged at the top part and shank for interaction with the ring collar of the neck. The diameter of the diaphragm is enough to afford overlapping the flange plug. The ring skirt and diaphragm define a cap. The diaphragm is coupled with the plug through rods made on its inner side and openings made in the plug flange. The rods pass through the openings. Each rod has a thickening at their end, diameter of the thickening being grater than the diameter of the flange openings. EFFECT: enhanced reliability. 1 dwg
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