socket 2 of a second pipe t2 coaxial with axis x x an elastomeric gasket 3 being placed between the male end and the socket and provided with metal locking elements e the socket 2 has at its entrance end following a collar 4 a cylindrical groove 5 of axial length l followed after a radial step formed by a shoulder 6 by a cylindrical wall 7 having a diameter less than the internal diameter of the groove 5 the gasket 3 as shown in fig2 has on its outer surface an anchoring heel 8 of width a corresponding to the axial length of the groove 5 of the socket the outer surface of the anchoring heel 8 is cylindrical about axis x x and it is extended by a sealing body 9 with an outer surface of revolution 10 cylindrical about axis x x the anchoring heel 8 is connected to the surface 10 by a transverse cheek 11 which forms a step between the peripheral surfaces of the anchoring heel and the sealing body the external diameter of the anchoring heel 8 corresponds to the internal diameter of the groove 5 of the socket and the outer surface of the gasket formed by the anchoring heel the cheek 11 and the surface 10 has a profile corresponding to the inner profile of the socket formed by the groove 5 the shoulder 6 and the wall 7 the gasket has on its inner face a frustoconical surface 12 which is connected to the surface 10 of the sealing body by a curved surface 13 the sealing body is therefore limited by the surfaces 10 12 and 13 the gasket is limited at its opposite end by a radial face 14 which is connected to the anchoring heel.