Integrated joining system with tubular fluid distribution elements, the system comprising: • tubular elements (1, 1'), each tubular element having a first enlarged cup-shaped end and a second opposite end equipped with a radial protuberance, wherein said first end is equipped with a specially shaped flange having a concentric edge external to the tubular element and a respective cavity facing the inside of said tubular element, capable of receiving and retaining inside an elastomeric gasket of circular or other convenient form and wherein said first end is equipped with a radial groove which is also concentric, placed side by side and external to said concentric edge, equipped with an end edge protruding with respect to the external surface of the tubular element itself, wherein the assembly of the tubular elements takes place by inserting the second end of one of the tubular elements inside the cup-shaped end of a similar tubular element until the end of its axial stroke up to the contact of a base or shoulder of the cup-shaped end with the edge of the second end, after said edge has passed the elastomeric gasket housed in the cavity, • a junction block comprising two semicircles (27, 27') placed radially around the tubular element (1, 1') at this concentric edge and at this end edge which, by tightening itself by means of clamping elements, crimps the two tubular elements (1, 1'), characterised in that the two semicircles (27, 27'), in the internal part, have radial cavities (15, 16) specially shaped so as to house inside them the outer concentric edge of the flange in a first cavity and the end edge of the said flange in a second cavity and the edge of the junction block which is close to the second cavity has an inclined wall which rests and covers the radial protuberance of the tubular element and is equipped with a tooth which rests on the external surface of the tubular element whereby the two semicircles geometrically copy the profile of the flange of the similar tubular element, the radial protuberance and the adjacent part of the tubular element thus creating a solid crimping constraint when tightening screws comprised in the clamping elements of the junction block are turned. • tubular elements (1, 1'), each tubular element having a first enlarged cup-shaped end and a second opposite end equipped with a radial protuberance, wherein said first end is equipped with a specially shaped flange having a concentric edge external to the tubular element and a respective cavity facing the inside of said tubular element, capable of receiving and retaining inside an elastomeric gasket of circular or other convenient form and wherein said first end is equipped with a radial groove which is also concentric, placed side by side and external to said concentric edge, equipped with an end edge protruding with respect to the external surface of the tubular element itself, wherein the assembly of the tubular elements takes place by inserting the second end of one of the tubular elements inside the cup-shaped end of a similar tubular element until the end of its axial stroke up to the contact of a base or shoulder of the cup-shaped end with the edge of the second end, after said edge has passed the elastomeric gasket housed in the cavity, • a junction block comprising two semicircles (27, 27') placed radially around the tubular element (1, 1') at this concentric edge and at this end edge which, by tightening itself by means of clamping elements, crimps the two tubular elements (1, 1'),