METAL PIPES AND TUBES, FLEXIBLE METAL PIPES AND TUBES, METAL PIPE COUPLINGS, SLEEVES, TEES, COLLARS, CLAMPS, METAL PIPE AND TUBE ELBOWS, METAL CHIMNEYS AND METAL CHIMNEY PIPES, METAL FLU COVERS FOR CHIMNEYS, METAL FIRESTOP PANELS FOR CHIMNEYS; AND METAL SPACERS FOR PIPES