| 摘要 |
PROBLEM TO BE SOLVED: To transmit impact noise generated when an engaging member is fitted to a flexible gas pipe to an outer part of a coupling main body in a large sound volume condition. SOLUTION: A leading-out groove 21b is formed on an outer peripheral surface of a small diameter part 21 of a male screw member 2. One end part of the leading-out groove 21b is faced to a space 31 wherein the engaging member 8 in the coupling main body 1 is disposed, and the other end part is faced to a space S2 disposed on an outer part of the coupling main body 1.
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