A sealed and locked assembly, comprising - a spigot end of a first pipe member, - a socket end, of a second pipe member and - a composite sealing gasket for the sealed and locked assembly between the spigot end and the socket end, the socket end comprising an anchoring groove delimited by a bottom surface and a front surface, and the composite sealing gasket comprising - a ring of elastic material extending according to a central axis (X-X), having a gasket body and an anchor bead, and - at least one locking insert for locking the joint between the spigot end and the socket end, and at least partially embedded in the gasket body, the locking insert comprising: - a radial outer head at least partially embedded in the gasket body and extending into the anchoring groove of the socket end, and - a radial inner foot intended to press against the spigot end and including at least a first engagement tooth (82, 84, 86) adapted to grip an outer surface of the spigot end, and the head including a radial projection, characterized in that the anchoring groove is delimited by an inclined surface, the inclined surface and the end surface forming a connection recess between them and forming an angle (γ) between them which is less than 180°, in that the head includes a stopping tooth, adapted to press into the connection recess when the foot grips the outer surface of the spigot end, in that the stopping tooth and the radial projection are arranged such that, for any diameter of the bottom surface of the socket end and of the outer surface of the spigot end within a range of manufacturing tolerances and in a meridian cross-sectional view, the stopping tooth of the locking insert is supported in the connecting recess. - a spigot end of a first pipe member, - a socket end, of a second pipe member and - a composite sealing gasket for the sealed and locked assembly between the spigot end and the socket end, the socket end comprising an anchoring groove delimited by a bottom surface and a front surface, and the composite sealing gasket comprising - a ring of elastic material extending according to a central axis (X-X), having a gasket body and an anchor bead, and - at least one locking insert for locking the joint between the spigot end and the socket end, and at least partially embedded in the gasket body, the socket end comprising an anchoring groove delimited by a bottom surface and a front surface, and the composite sealing gasket comprising - a ring of elastic material extending according to a central axis (X-X), having a gasket body and an anchor bead, and - at least one locking insert for locking the joint between the spigot end and the socket end, and at least partially embedded in the gasket body, - a ring of elastic material extending according to a central axis (X-X), having a gasket body and an anchor bead, and - at least one locking insert for locking the joint between the spigot end and the socket end, and at least partially embedded in the gasket body, - a radial outer head at least partially embedded in the gasket body and extending into the anchoring groove of the socket end, and - a radial inner foot intended to press against the spigot end and including at least a first engagement tooth (82, 84, 86) adapted to grip an outer surface of the spigot end, and the head including a radial projection, characterized in that the anchoring groove is delimited by an inclined surface, the inclined surface and the end surface forming a connection recess between them and forming an angle (γ) between them which is less than 180°, in that the head includes a stopping tooth, adapted to press into the connection recess when the foot grips the outer surface of the spigot end, in that the stopping tooth and the radial projection are arranged such that, for any diameter of the bottom surface of the socket end and of the outer surface of the spigot end within a range of manufacturing tolerances and in a meridian cross-sectional view, the stopping tooth of the locking insert is supported in the connecting recess. the head including a radial projection, characterized in that the anchoring groove is delimited by an inclined surface, the inclined surface and the end surface forming a connection recess between them and forming an angle (γ) between them which is less than 180°, in that the head includes a stopping tooth, adapted to press into the connection recess when the foot grips the outer surface of the spigot end, in that the stopping tooth and the radial projection are arranged such that, for any diameter of the bottom surface of the socket end and of the outer surface of the spigot end within a range of manufacturing tolerances and in a meridian cross-sectional view, the stopping tooth of the locking insert is supported in the connecting recess.