"PIPE COUPLING UNION" The invention relates to the pipe coupling joint which comprises a coupling body (10) provided with an open passage (11) at one end (12) to receive an extreme part of a pipe (13 ) and provided with an internal flesh surface (29) decreasing towards the open end on which a mandrel (25) is located to lock the tube in the coupling body by engaging with the decreasing meat surface, and having stop devices ( 19) to limit the entry of the mandrel into the passage. The coupling body having a main body (10a) through which it receives the end of a tube and contains the stop devices to limit the insertion of the mandrel and an end cap (10b) in relation to a screwed engagement with the main body containing the open end (12) for the passage and the decreasing cam surface (24). Gradually advancing devices (24,30,31,33) between the end cap and the main body to define rotation adjustment positions in the first of which a tube can be inserted and, pressing the mandrel into the coupling body , detached from the coupling body and in the second of which the mandrel is engaged with the stop device to prevent the mandrel from being pressed into the coupling body to detach the tube.
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