the two halves at approximately right angles to each other relative to the central axis the connector halves 12 and 12 u2032 are rotated relative to each other thereby causing proximal knuckles 22 and 22 u2032 to enter and engage with proximal passages 24 and 24 u2032 respectively similarly such rotation causes distal knuckles 26 and 26 u2032 to enter and engage with distal passages 28 and 28 u2032 respectively proximal knuckles 22 and 22 u2032 have proximal knuckle faces 40 and 40 u2032 respectively each being formed with an at least partially radiussed or curved surface this is to permit rotational engagement of proximal knuckles 22 and 22 u2032 with proximal passages 40 and 40 u2032 proximal passages faces 42 and 42 u2032 are planar as shown in fig4 and 5 in order to restrict complete rotation of connector body halves 12 and 12 u2032 in a similar manner distal passages 28 and 28 u2032 have distal passage faces 46 and 46 u2032 respectively wherein each distal passage face is shaped with an at least partially radiussed or curved planar cross section to permit rotational engagement of distal knuckles 26 and 26 u2032 within distal passages 28 and 28 u2032 distal knuckle faces 44 and 44 u2032 are planar in cross section in order to limit the rotation of connector body halves 12 and 12 u2032 connector body halves 12 and 12 u2032 are considered to be in a fastened mode when proximal knuckle faces 40 and 40 u2032 contact proximal passage faces 42 and 42 u2032 respectively and distal knuckle.