The present invention relates especially to a radially expandable tubular metallic element (2) which comprises on its external face (211) at least a series of annular sealing lips (5) made of elastically deformable material, these lips being spaced in pairs, the transversal cross section of each lip (5) having an end face (51) and two lateral walls (52, 53), characterized in that said lips (5) are in a non-metallic material and are inclined in the same direction, relative to said external face (211), that is, each of the lateral walls (52, 53) of each lip (5) forms a non-zero angle (α; β) relative to a radial plane (PR) of said element.