Fluid distribution outlet for distributing a fluid within a hospital building, comprising an outlet body of elongate shape, and of longitudinal axis AA, passed through axially by a central passage forming an internal housing within which there is arranged an extractable endpiece guide which houses a movable head valve, and an extractable ball-valve chamber, the extractable endpiece guide further comprising an axial rod protruding from the rear outer surface of the endpiece guide and being integral with said endpiece guide, and said extractable ball-valve chamber comprising: - a peripheral wall delimiting an internal compartment containing a movable ball-valve, and carrying an outer peripheral thread formed around said peripheral wall, the movable ball-valve having a spherical shape or comprising an elongate base surmounted by a semi-spherical head, - a first end with a fluid passage in fluidic communication with the internal compartment via an internal orifice and with the outside of the ball-valve chamber via an external orifice, and - a second end with a wide opening in fluidic communication with the internal compartment, and wherein: - the endpiece guide comes to rest on the ball-valve of the extractable ball-valve chamber via the axial rod protruding from the rear outer surface of the endpiece guide, through the axial fluid passage, and - the peripheral wall of the extractable ball-valve chamber is shaped to have wall extensions arranged at the second end, said wall extensions protruding a distance from said peripheral wall and being folded radially towards the longitudinal axis so as to retain the movable ball-valve there, and - the central passage of the outlet body comprises a first thread cooperating with the peripheral thread formed in the peripheral wall of the ball-valve chamber in order to allow the ball-valve chamber to be mounted in the outlet body by screwing, characterized in that - the axial fluid passage arranged in the first end of the extractable ball-valve chamber is shaped to have a non-circular cross section on an inlet segment extending from the outer orifice of the axial fluid passage and towards the inner orifice of the axial fluid passage, in order to allow the ball-valve chamber to be screwed inside the fluid distribution outlet, by means of a tool having a shape complementing the non-circular cross section. - a peripheral wall delimiting an internal compartment containing a movable ball-valve, and carrying an outer peripheral thread formed around said peripheral wall, the movable ball-valve having a spherical shape or comprising an elongate base surmounted by a semi-spherical head, - a first end with a fluid passage in fluidic communication with the internal compartment via an internal orifice and with the outside of the ball-valve chamber via an external orifice, and - a second end with a wide opening in fluidic communication with the internal compartment, - the endpiece guide comes to rest on the ball-valve of the extractable ball-valve chamber via the axial rod protruding from the rear outer surface of the endpiece guide, through the axial fluid passage, and - the peripheral wall of the extractable ball-valve chamber is shaped to have wall extensions arranged at the second end, said wall extensions protruding a distance from said peripheral wall and being folded radially towards the longitudinal axis so as to retain the movable ball-valve there, and - the central passage of the outlet body comprises a first thread cooperating with the peripheral thread formed in the peripheral wall of the ball-valve chamber in order to allow the ball-valve chamber to be mounted in the outlet body by screwing, - the axial fluid passage arranged in the first end of the extractable ball-valve chamber is shaped to have a non-circular cross section on an inlet segment extending from the outer orifice of the axial fluid passage and towards the inner orifice of the axial fluid passage, in order to allow the ball-valve chamber to be screwed inside the fluid distribution outlet, by means of a tool having a shape complementing the non-circular cross section.