PROBLEM TO BE SOLVED: To surely connect a body and an adapter in the connector of a main circuit and a branch circuit.SOLUTION: The body 12 of the connector 10 has a tube 16 to be a part of the main circuit, and a valve part 26 is provided to the side face of the tube 16. On the side face of the tube 16, two projection receiving parts 44 having a roughly U-shaped cross section are provided to positions holding the valve part therebetween. On the side face of a cover part 48 covering the valve part of the adapter 14, two locking projections 42 are projected to the outer side of the radial direction oppositely to each other. The adapter is rotated, and the locking projections 42 are advanced into the projection receiving parts 44 from the side to hold the locking projections 42 by the projection receiving parts 44.COPYRIGHT: (C)2011,JPO&INPIT【課題】主回路と分岐回路との接続具の、本体とアダプタとの結合を確実なものとする。【解決手段】接続具10の本体12は、主回路の一部となる管体16を有し、管体16の側面には弁部26が設けられている。管体16の側面には、弁部を挟む位置に、略コの字形の断面を有する2個の突起受け部44が設けられている。アダプタ14の、弁部を覆うカバー部48の側面には、2個の係止突起42が径方向外側に、かつ互いに反対に向けて突設されている。アダプタを回転させて、係止突起42を突起受け部44内に側方より進入させて、突起受け部44にて係止突起42を保持する。【選択図】図1