A sheathing repair assembly for a tension member of a post-tensioning tendon, the tension member comprising a strand and a sheathing layer, the sheathing repair assembly comprising: a repair tube (274, 374, 474, 574, 644) having first and second end portions; a first sealing assembly (200, 300, 400, 500, 600) comprising: a first nut having a first frustoconical surface (252, 352); and a first forcing element adapted to cooperate with the first frustoconical surface so as to compress the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574); and a second sealing assembly comprising: a second nut having a second frustoconical surface (252, 352); and a second forcing element adapted to cooperate with the second frustoconical surface (252, 352) so as to compress the second end portion (52, 276, 376) of the repair tube (274, 374, 474, 574, 644); wherein the first and second end portions (51, 52, 276, 376) of the repair tube (274, 374, 474, 574) each includes an expansion portion (275, 375) that includes: a tapered wall thickness, a diameter greater than a diameter of the rest of the repair tube (274, 374, 474, 574), longitudinal slots, longitudinal grooves, an internal friction device, or an external friction device, characterized by: the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the first forcing element (250, 480) and the first frustoconical surface, and; the second end portion (52, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the second forcing element and the second frustoconical surface. a repair tube (274, 374, 474, 574, 644) having first and second end portions; a first sealing assembly (200, 300, 400, 500, 600) comprising: a first nut having a first frustoconical surface (252, 352); and a first forcing element adapted to cooperate with the first frustoconical surface so as to compress the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574); and a first nut having a first frustoconical surface (252, 352); and a first forcing element adapted to cooperate with the first frustoconical surface so as to compress the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574); and a second sealing assembly comprising: a second nut having a second frustoconical surface (252, 352); and a second forcing element adapted to cooperate with the second frustoconical surface (252, 352) so as to compress the second end portion (52, 276, 376) of the repair tube (274, 374, 474, 574, 644); wherein the first and second end portions (51, 52, 276, 376) of the repair tube (274, 374, 474, 574) each includes an expansion portion (275, 375) that includes: a tapered wall thickness, a diameter greater than a diameter of the rest of the repair tube (274, 374, 474, 574), a tapered wall thickness, a diameter greater than a diameter of the rest of the repair tube (274, 374, 474, 574), longitudinal slots, longitudinal grooves, an internal friction device, or an external friction device, characterized by: the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the first forcing element (250, 480) and the first frustoconical surface, and; the second end portion (52, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the second forcing element and the second frustoconical surface. the first end portion (51, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the first forcing element (250, 480) and the first frustoconical surface, and; the second end portion (52, 276, 376) of the repair tube (274, 374, 474, 574, 644) being compressed between the second forcing element and the second frustoconical surface.