Female connector of a plug-in connector and plug-in connector

A female connector comprising;

• a first end configured to be attached to a pipe or hose;
• a second end configured to be connected to a male connector, the second end having housed therein a retention device configured to retain the male connector inside the female connector;
• a central body located between the first and second ends;
• and
• a cover permanently joined to the female connector at the second end covering the retention device preventing access to the retention device from an exterior of the female connector when the female connector is connected to the male connector;
• the retention device comprising an elastic rod having a central segment and first and second side retention arms that each extend from the central segment, the second end of the female connector including first and second side grooves in which the respective first and second retention arms are at least partially housed, at least part of each of the first and second retention arms are configured to cooperate with the male connector to retain the male connector inside the female connector, the first and second arms having respective first and second ends that are located outside the central body of the female connector, the cover including first and second enclosures in which the first and second ends of the first and second retention arms are respectively housed, each of the first and second enclosures being demarcated by an end of the cover, the first and second ends of the first and second retention arms having a freedom of movement inside the respective first and second enclosures during an insertion of the male connector into the female connector;
• the second end of the female connector including a protuberance arranged between the first and second ends of the first and second retention arms, the cover having a guiding channel in which the protuberance is housed.