| 摘要 |
<p>PURPOSE: To provide a plug attaching device in which safety is easily secured, workability is good, and reliability after fastening of a plug can be enhanced. CONSTITUTION: Gas pressure to act on a field screw 80 from a pipe body side to be plug-fastened is received by an internal thread 62 part of an extending and contracting operation handle 60 provided on a main body 40 side, and the field screw 80 on which a plug 25a is mounted is extended and contracted by the rotational operation of the extending and contacting operation handle 60.</p> |
