A fluid communication device including a tubular body which enables the circulation of a fluid and which has an end piece that is connectable to a plug-in pipe having an outer annular locking groove. An assembly head includes a receiving chamber in which an end piece of the tubular body is mounted. The assembly head includes a U-shaped locking element having two arms that are inserted into the receiving chamber. An intermediate ring is slidably mounted in the receiving chamber to achieve a pre-opening of the locking element just before the plug-in pipe reaches a position in which it engages with the end piece.