A quick connector for connecting a tubular male part in an axial direction to a female part (40; 40A), comprising: sealing means adapted to be set within a mouth portion (41; 41A) of the female part (40; 40A) to form a seal between the male part and the female part (40; 40A); retaining means adapted to be set within the mouth portion (41; 41A) and having at least two first flexing members protruding radially inwards for snapping engagement with the male part and at least two second flexing members protruding radially outwards for snapping engagement with the female part, wherein each pair of circumferentially adjacent first and second flexing members (11, 12) is connected by a web portion having a main longitudinal axis which extends directly from the first flexing member to the second flexing member; and releasing means which includes: a ring portion having an outer diameter which is larger than the inner diameter of the retaining means at a first axial end at which the first flexing members are provided but smaller than the inner diameter of the retaining means at a second axial end at which the second flexing members are provided; and a gripping part connected to the ring portion and provided axially spaced from the ring portion so as to protrude from the mouth portion (41; 41A) of the female part (40; 40A), wherein the gripping part allows an operator in a releasing operation to push the ring portion towards the first axial end of the retaining means so that the first flexing members are bent in the radial direction and disengage from the male part, characterised in that the outer circumference of the ring portion has at least one radial protrusion for latching into a notch-like first gap between two adjacent first flexing members. sealing means adapted to be set within a mouth portion (41; 41A) of the female part (40; 40A) to form a seal between the male part and the female part (40; 40A); retaining means adapted to be set within the mouth portion (41; 41A) and having at least two first flexing members protruding radially inwards for snapping engagement with the male part and at least two second flexing members protruding radially outwards for snapping engagement with the female part, wherein each pair of circumferentially adjacent first and second flexing members (11, 12) is connected by a web portion having a main longitudinal axis which extends directly from the first flexing member to the second flexing member; and releasing means which includes: a ring portion having an outer diameter which is larger than the inner diameter of the retaining means at a first axial end at which the first flexing members are provided but smaller than the inner diameter of the retaining means at a second axial end at which the second flexing members are provided; and a gripping part connected to the ring portion and provided axially spaced from the ring portion so as to protrude from the mouth portion (41; 41A) of the female part (40; 40A), wherein the gripping part allows an operator in a releasing operation to push the ring portion towards the first axial end of the retaining means so that the first flexing members are bent in the radial direction and disengage from the male part, characterised in that the outer circumference of the ring portion has at least one radial protrusion for latching into a notch-like first gap between two adjacent first flexing members. a ring portion having an outer diameter which is larger than the inner diameter of the retaining means at a first axial end at which the first flexing members are provided but smaller than the inner diameter of the retaining means at a second axial end at which the second flexing members are provided; and a gripping part connected to the ring portion and provided axially spaced from the ring portion so as to protrude from the mouth portion (41; 41A) of the female part (40; 40A), wherein the gripping part allows an operator in a releasing operation to push the ring portion towards the first axial end of the retaining means so that the first flexing members are bent in the radial direction and disengage from the male part, characterised in that the outer circumference of the ring portion has at least one radial protrusion for latching into a notch-like first gap between two adjacent first flexing members.