Fluidic connector plug for establishing a fluid-tight connection of a pipe-like, tube-like or hose-like conduit to a port, especially for a compressed-air system of a commercial vehicle, a) with an inner part comprising a recess passing through the inner part, in which the conduit is accommodated, where the inner part comprises a holding element which secures the conduit in the inner part and b) with an outer part in which the inner part is accommodated and which is insertable into the port, c) where a radial bias of the holding element of the inner part is achieved via a biasing element of the outer part, in which way the conduit is more strongly secured in the inner part, d) with a securing element which in a state inserted into the port and when pulling forces are effective onto the conduit secures the outer part with a securing force from being removed from the port, characterised in that e) the securing element and/or the securing element with the outer part is insertable into the port with an insertion force which is smaller by at least one magnitude than the maximum securing force with respect to removal from the port, where fa) the securing element forms a latching connection with the port and the securing element is realised with at least one radially yielding flexible tongue (12; 68) and a or one flexible tongue is inclined with respect to the direction of insertion under a reflex angle, the port comprises a back taper, a latching connection being formed when inserting the flexible tongue into the back taper, during the insertion of the securing element into the port and before the flexible tongue enters into the back taper the flexible tongue being subjected to bending stress and/or being subjected to tensile stress due to a frictional force between the flexible tongue and the port and when tensile forces are effective onto the conduit the flexible tongue with a front face is pressed against a latching surface formed by the back taper, in which way the flexible tongue is subjected to compressive force, or fb) the securing element is realised with at least one radially yielding flexible tongue (12; 68) and a degree of freedom of the yielding flexible tongue radially inwards, which is usable during insertion of the securing element into the port, is at least limited by the outer part in the mounted state or the flexible tongue is biased radially outwardly by the outer part or fc) the securing element is realised with at least one radially yielding flexible tongue (12; 68) and forms a latching connection with the port and by the design of the latching declines, choice of the length and the cross section of a spring arm of a latching element of the latching connection and choice of the rigidity of a spring arm of the latching element the behaviour during latching and on the other hand the securing effect with respect to releasing the latching connection are constructively defined. a) with an inner part comprising a recess passing through the inner part, in which the conduit is accommodated, where the inner part comprises a holding element which secures the conduit in the inner part and b) with an outer part in which the inner part is accommodated and which is insertable into the port, c) where a radial bias of the holding element of the inner part is achieved via a biasing element of the outer part, in which way the conduit is more strongly secured in the inner part, d) with a securing element which in a state inserted into the port and when pulling forces are effective onto the conduit secures the outer part with a securing force from being removed from the port, e) the securing element and/or the securing element with the outer part is insertable into the port with an insertion force which is smaller by at least one magnitude than the maximum securing force with respect to removal from the port, where fa) the securing element forms a latching connection with the port and the securing element is realised with at least one radially yielding flexible tongue (12; 68) and a or one flexible tongue is inclined with respect to the direction of insertion under a reflex angle, the port comprises a back taper, a latching connection being formed when inserting the flexible tongue into the back taper, during the insertion of the securing element into the port and before the flexible tongue enters into the back taper the flexible tongue being subjected to bending stress and/or being subjected to tensile stress due to a frictional force between the flexible tongue and the port and when tensile forces are effective onto the conduit the flexible tongue with a front face is pressed against a latching surface formed by the back taper, in which way the flexible tongue is subjected to compressive force, or fb) the securing element is realised with at least one radially yielding flexible tongue (12; 68) and a degree of freedom of the yielding flexible tongue radially inwards, which is usable during insertion of the securing element into the port, is at least limited by the outer part in the mounted state or the flexible tongue is biased radially outwardly by the outer part or fc) the securing element is realised with at least one radially yielding flexible tongue (12; 68) and forms a latching connection with the port and by the design of the latching declines, choice of the length and the cross section of a spring arm of a latching element of the latching connection and choice of the rigidity of a spring arm of the latching element the behaviour during latching and on the other hand the securing effect with respect to releasing the latching connection are constructively defined.