| 摘要 |
An in-line coupling pipe is provided having a plurality of first corrugations with a male portion at one end of the pipe and a female portion at the other end. The diameter at the crest of the first corrugation being a first distance. The male portion having a second corrugation with the diameter at the crest of the second corrugation being a second distance. The male portion of having a third corrugation intermediate the first corrugation and the second corrugation, with the diameter at the crest of the third corrugation being a third distance. The male portion having a fourth corrugation intermediate the first corrugation and the third corrugation, with the diameter at the crest of the fourth corrugation being a fourth distance, with the first distance being greater than the second or third or fourth distances, the second distance being greater than the third distance, and the fourth distance being greater than second or third distances. The second corrugation has a recess formed therein.
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