Abstract: A joint for bringing into communication a first fluid passageway and a second fluid passageway of a nut member includes a push rod and a main body. The main body forms a push rod storage space, a communication path, a seal structure forming part and a male thread part. The push rod storage space houses the push rod so that one part of the push rod protrudes along a push rod longitudinal direction. The seal structure forming part is capable of forming a seal structure by contacting a first tapered part of the nut member. The male thread part is capable of screwing together with a female thread part of the nut member such that the seal structure forming part contacts the first tapered part. The part of the portion of the push rod contacts one part of the nut member.

Abstract: A joint for bringing into communication a first fluid passageway and a second fluid passageway of a nut member includes a push rod and a main body. The main body forms a push rod storage space, a communication path, a seal structure forming part and a male thread part. The push rod storage space houses the push rod so that one part of the push rod protrudes along a push rod longitudinal direction. The seal structure forming part is capable of forming a seal structure by contacting a first tapered part of the nut member. The male thread part is capable of screwing together with a female thread part of the nut member such that the seal structure forming part contacts the first tapered part. The part of the portion of the push rod contacts one part of the nut member.

Abstract: On a wiring board, an optical connection cable is provided in which a wiring light cord and a conducting wire are laid out in parallel. A primary side port and a secondary side port are optically connected for wiring, and are electrically connected to confirm the connection. When both ports are electrically connected, it is possible to confirm that the primary side port and the secondary side port are connected and a circuit is formed.

Abstract: On a wiring board, an optical connection cable is provided in which a wiring light cord and a conducting wire are laid out in parallel. A primary side port and a secondary side port are optically connected for wiring, and are electrically connected to confirm the connection. When both ports are electrically connected, it is possible to confirm that the primary side port and the secondary side port are connected and a circuit is formed.