Abstract: The present disclosure describes a device for connection, by means of an injected assembly fluid, of a first and a second pipe elements for transport of liquid or gaseous fluid, the second element having a socket receiving an end of the first element, comprising a diffusion part for diffusion of the injected assembly fluid, the diffusion part being adapted to be arranged on a circumference of the first element and against an edge of the socket, said diffusion part having at least one opening for the injection of assembly fluid into said diffusion part. The diffusion part forms a chamber for collecting said assembly fluid and for distributing it circumferentially. The device comprises directing means allowing to actively direct the assembly fluid towards a connection space between the socket and the first element.