| 摘要 |
This connection piece consists of a tubular sleeve (11), the internal diameter (D) of which is just bigger than the external diameter (D1) of the sluice valve tube (2) and equipped, at one of its ends, with an annular flange (12) and, in an intermediate zone of its bore, with an internal beading (13) the internal diameter (d) of which is less than the external diameter of the sluice valve tube (2). <IMAGE>
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