6 METAL PIPES AND TUBES, FLEXIBLE METAL PIPES AND TUBES, METAL COUPLINGS FOR USE WITH METAL PIPES; METAL PIPE FITTINGS, NAMELY, SLEEVES, TEES, COLLARS, CLAMPS, METAL PIPE AND TUBE ELBOWS, METAL CHIMNEYS AND METAL CHIMNEY PIPES, METAL FLU COVERS, METAL FIRESTOP PANELS; AND METAL PIPE FITTINGS IN THE NATURE OF SPACERS