| 摘要 |
Each member has four hubs (3) located opposite one another in pairs, at opposite ends. Each hub (3) has a flange (8) arranged concentrically around a circular opening (6). If the flange (8) is not welded to flanges of adjacent members, but is nippled or forms the end of a steel radiator, a groove (9), which is concentric with the opening (6) and into which an O-ring (10) is inserted, is provided in the flange (8). <IMAGE>
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