Part to be welded inside of tube.Dimensions are in inches secondary are in millimeters

Part to be welded inside of tube.
部分（或者指零部件,要看前后文决定）是将被用在管子内部进行焊接的
Dimensions are in inches secondary are in millimeters
规格的尺码用的是“英寸”,次要（或附属单位）用的是“毫米”.
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