| 摘要 |
PROBLEM TO BE SOLVED: To provide joint structure allowing easy jointing for embedment or the like and the positive confirmation of a jointed condition caused by insufficient fastening or forgetting to fasten and contributing to cost reduction with simple structure. SOLUTION: In this joint structure of fastening a box nut 10 to an external screw part 2 of a connection part 1 of a valve, a joint or the like for connection, a confirmation ring 5 is mounted to the inner side end part of the external screw part 2, and the confirmation ring 5 is covered with the box nut 10 fastened to the external screw part 2 of the connection part 1.
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