The utility model discloses a corrugated metal pipe is used to high gas tightness gas utensil, its technical scheme main points are including the corrugate body by a plurality of cyclic annular ripple thin -wall cases stacks permutation generation, the both ends of body all are provided with loose joint portion, loose joint portion including fixed cover establish that union and cover on the body is established on the union and can relative union slide and with loose joint cover that the retainer plate is sealed fixed, the union establish the retainer plate on the body outer wall and supply the gliding pull ring of loose joint cover including the cover, the retainer plate the middle part to the axial lead department at retainer plate place protruding form can with the outer wall sealing connection's of body bellying, the outer wall of body on still the heat -seal laminating have the protective layer that is used for the protection tube body. The utility model discloses when guaranteeing that the bellows has better gas tightness, still waterproof, antifouling, corrosion -resistant lamp guard action has been played to the bellows.