| 摘要 |
It comprises a plug (3) intended to cooperate with the upper orifice of the upright (2) and which comprises means (3b, 3c) for being locked with respect to this orifice, on the one hand in the closed position and, on the other hand, in the inverted position, the said plug (3) being furthermore provided with means (3f) for receiving the valve control key so that, in the inverted position, the plug constitutes the operating member of the upright (2). <IMAGE>
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