The outer sleeve is attached to the inner sleeve by being deflected around annular ridge at one end of the inner sleeve.
套装在第一个套管内的第二个套管，在第一个套管和第二个套管之间留出一段环形空间，用以容纳管子的端头；
The outer sleeve is attached to the inner sleeve by being deflected around annular ridge at one end of the inner sleeve.
套装在第一个套管内的第二个套管，在第一个套管和第二个套管之间留出一段环形空间，用以容纳管子的端头；
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