| 摘要 |
PROBLEM TO BE SOLVED: To provide a tube having easy and simple connecting work to a joint, a positive connecting state, no leakage of gas or liquid, and no loosening even when a pressure is applied. SOLUTION: Easy-to-see marks 31 are provided in a plurality of positions continuous at size intervals equivalent to a required insertion size m inherent to a joint to be used from respective end parts 30a of both ends of the tube 30 toward a center of length.
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