End piece to apply to a free end of a corrugated tube, comprising: a) a socket having a front region facing towards the free end of the corrugated tube and a rear region lying opposite this front region in a longitudinal direction of the socket, said rear region being situated inside the corrugated tube in the assembled state of the socket, wherein a1) the front region of the socket consists of a collar which encloses the free end of the corrugated tube at least partially, projects radially in the direction of an external space which is not enclosed by the socket, and forms a groove which runs along the periphery of the socket and which opens in the longitudinal direction of the socket for the at least partial reception of the free end of the corrugated tube, and wherein a2) the rear region of the socket consists of a plurality of spring tongues which have an unloading orientated perpendicularly to the longitudinal direction of the socket and are directed in the direction of the external space of the socket, wherein at least one part of the spring tongues each have at least one radially projecting latching projection on their outer side facing towards the external space, for the implementation of an effective tongue and groove system in the longitudinal direction of the socket, b) a securing sleeve which is able to be received by the socket and which extends, in the assembled state of the end piece, into at least one part of the rear region in the longitudinal direction of the socket in an internal space enclosed by the socket and limits the radial clearance of the spring tongues in the direction of the internal space of the socket. a) a socket having a front region facing towards the free end of the corrugated tube and a rear region lying opposite this front region in a longitudinal direction of the socket, said rear region being situated inside the corrugated tube in the assembled state of the socket, wherein a1) the front region of the socket consists of a collar which encloses the free end of the corrugated tube at least partially, projects radially in the direction of an external space which is not enclosed by the socket, and forms a groove which runs along the periphery of the socket and which opens in the longitudinal direction of the socket for the at least partial reception of the free end of the corrugated tube, and wherein a2) the rear region of the socket consists of a plurality of spring tongues which have an unloading orientated perpendicularly to the longitudinal direction of the socket and are directed in the direction of the external space of the socket, wherein at least one part of the spring tongues each have at least one radially projecting latching projection on their outer side facing towards the external space, for the implementation of an effective tongue and groove system in the longitudinal direction of the socket, a1) the front region of the socket consists of a collar which encloses the free end of the corrugated tube at least partially, projects radially in the direction of an external space which is not enclosed by the socket, and forms a groove which runs along the periphery of the socket and which opens in the longitudinal direction of the socket for the at least partial reception of the free end of the corrugated tube, and wherein a2) the rear region of the socket consists of a plurality of spring tongues which have an unloading orientated perpendicularly to the longitudinal direction of the socket and are directed in the direction of the external space of the socket, wherein at least one part of the spring tongues each have at least one radially projecting latching projection on their outer side facing towards the external space, for the implementation of an effective tongue and groove system in the longitudinal direction of the socket, b) a securing sleeve which is able to be received by the socket and which extends, in the assembled state of the end piece, into at least one part of the rear region in the longitudinal direction of the socket in an internal space enclosed by the socket and limits the radial clearance of the spring tongues in the direction of the internal space of the socket.