Method of making a laminated tubular body

A method of manufacturing a laminated tubular body comprising the steps of drawing opposite longitudinal edges of a strip of sheet material into close proximity, joining said longitudinal edges to form a tubular body having an inner surface and an outer surface, forming at least one aperture in the tubular body, extruding a hollow lining member from a die, expanding the hollow lining member within the tubular body to form a substantially continuous lining in intimate contact with said inner surface, said lining extending through said at least one aperture to form a sealed protuberance projecting outwardly beyond the outer surface of said tubular body.