A cap for locking assembly of an enteral feeding system, the locking assembly comprising a base of a catheter device and a connector adapted to be removably connected to the base so that the connector and base are locked with each other in vertical and horizontal direction, the locking assembly being configured to be locked/unlocked by rotation of the connector relative to the base, - the base having a first end part, a central part and a second end part opposite the first end part, the first end part and second end part protruding from the central part, the base having an upper surface and lower surface, the upper surface comprising a first locking element, - the connector comprising a connector body and a conduit, the conduit defining a fluid pathway and being coupled to a tube, the connector body comprising an upper surface and lower surface, the lower surface comprising a second locking element having a shape mating with the shape of the first locking element and being configured to move between an engaging configuration and a locking configuration, - in the engaging configuration, the first locking element and second locking element engage with each other, - in the locking configuration, in response to rotation of the connector relative to the base in a predetermined locking direction, the conduit lies above an end part (211, 212) of the base, called locking end part, and the first locking element and second locking element are engaged with each other to obtain locking together of the connector and base in vertical and horizontal direction, wherein: the cap comprises a cap body in elastically deformable material so that it can deform under a force and return to an initial non-deformed state after removal of the force, the cap body comprising a cap body having a top wall and a first vertical wall supporting the top wall and which is connected at a back end of the top wall, - the first vertical wall comprising a first passageway opening extending over all or part of a width and/or height of the first vertical wall, and which - in the engaging configuration, allows the passing of a tube, - in the locking configuration, closely surrounds at least all or part of the conduit and locking end part, to obtain rotational locking together of the base and connector, - the top wall comprising an inner surface defining a hollow housing formed in a thickness of the top wall so that, in the locking configuration, the hollow housing via snap-fit closely receives all or part of the upper surface of the connector body, the cap body being arranged so that, under the effect of the elastic properties of the cap body, the upper surface of the connector body enters the housing after the first passageway opening surrounds all or part of the conduit and locking end part. - the base having a first end part, a central part and a second end part opposite the first end part, the first end part and second end part protruding from the central part, the base having an upper surface and lower surface, the upper surface comprising a first locking element, - the connector comprising a connector body and a conduit, the conduit defining a fluid pathway and being coupled to a tube, the connector body comprising an upper surface and lower surface, the lower surface comprising a second locking element having a shape mating with the shape of the first locking element and being configured to move between an engaging configuration and a locking configuration, - in the engaging configuration, the first locking element and second locking element engage with each other, - in the locking configuration, in response to rotation of the connector relative to the base in a predetermined locking direction, the conduit lies above an end part (211, 212) of the base, called locking end part, and the first locking element and second locking element are engaged with each other to obtain locking together of the connector and base in vertical and horizontal direction, wherein: the cap comprises a cap body in elastically deformable material so that it can deform under a force and return to an initial non-deformed state after removal of the force, the cap body comprising a cap body having a top wall and a first vertical wall supporting the top wall and which is connected at a back end of the top wall, - the first vertical wall comprising a first passageway opening extending over all or part of a width and/or height of the first vertical wall, and which - in the engaging configuration, allows the passing of a tube, - in the locking configuration, closely surrounds at least all or part of the conduit and locking end part, to obtain rotational locking together of the base and connector, - the top wall comprising an inner surface defining a hollow housing formed in a thickness of the top wall so that, in the locking configuration, the hollow housing via snap-fit closely receives all or part of the upper surface of the connector body,