| 摘要 |
An end (29) of a tube (25) is closed off by a disk (31) which is locked in position in a joint formed with a collar (27) and a plate surround (28). The collar (27) includes a flange (26) which is secured against the lower face of the plate surround (28). The flange (26) may include ribs which act as torsion resistance ribs enhancing the engagement with the plate surround (28). In another embodiment, the collar (27) forms a tube end joint but not a closure.
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