| 摘要 |
Improvements consisting in giving the stem 5 bearing the disc or plate 6 via which the cap assembly rests on the floor, instead of the fin or flange 8, at least one pair of flaps 101 which project obliquely therefrom and are open in the direction opposite to that in which the rounded head 3 of the tubular body 1 of the cap is inserted into the passage 4, said pair of flaps being advantageously moulded in a single piece with the cap body and being joined to the mouth of said insertion passage 4 by small weak radial bridges 102 which break easily under pressure. <IMAGE>
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