| 摘要 |
PROBLEM TO BE SOLVED: To realize easy operation together with freedom from coming-off and reduce a manufacturing cost. SOLUTION: In a standard length gas supply and exhaust tube having a connecting receiver inlet 1 formed at its one end and having an outer bead 4 at its insertion port 3 side formed at the other end a structure that a window 2 is formed at the port 1 is provided. The structure further externally inserts a stopper ring 5 to the port 1 to make the stopper 5 an end 6a of a pawl 6 advance from the window 2 of the port 1 into the bead 4 to inhibit it from being removed. The structure further has a means for releasing the inhibition of removal of the pawl 6 from the bead 4 by sliding up the pawl 6 at the edge of the window 2 when the ring 5 is rotated. |
