FIELD: corking devices. SUBSTANCE: hollow is made in upper wall of a cap and has a truncated cone cross section. The smaller diameter base of the cone forms the bottom part of the hollow. The hollow walls are inclined to the bottom part at an angle of 30-60. The ratio between the cap height and the depth of the hollow is within 25-1.66. EFFECT: improved structure. 2 cl, 3 dwg
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