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1·The circular boundary between the reduction sleeve 2 and the filter body 3 are welded.

过渡套2与过滤体3之间外圆分界线焊接连接。

2·The circular boundary between the positioning sleeve 1 and the reduction sleeve 2 are welded.

定位套1与过渡套2之间外圆的分界线焊接连接。