Adapter for attaching an insertion device to a cable fitting

An adapter assembly for connecting a multi-contact electrical plug within a cable support arrangement includes an elongated adapter body containing a through passage and having a rectangular first end portion containing a chamber for receiving the electrical plug, and a tubular second end portion threadably connected adjacent its free extremity with a concentrically arranged cable sleeve, an annular sealing device being provided for sealing one end of the annular space defined between the cylindrical outer surface of the adapter body tubular end portion and the inner surface of the adjacent end portion of the concentrically arranged sleeve. A second annular seal is supported within the cable sleeve for sealing the entrance of the cable into the adapter through passage, and a third sealing ring is provided for sealing the space between the outer surface of the adapter body rectangular end portion and a slidably mounted outer sleeve member.