ARTICULATED PIPE ELEMENTS, METAL TUBES AND PROFILES; BELLOWS, SLEEVES, FLANGES, CAPS, RINGS AND HELICAL REINFORCING ELEMENTS MADE FROM SHEET METAL, METAL HOSE PIPES, PIPING AND HOSE COUPLINGS, HOSE CONNECTION PARTS, HOSE COUPLINGS OF THE PLUG AND SOCKET TYPE, TUBE COMPENSATORS, METAL FITTINGS FOR GAS LIQUID PIPING