Goods of metal and common metal alloys and goods coated in metal and common metal alloys included in this class; metal and metal coated pressings, castings and forgings; welded steel stock; welded metal coated stock; pipes of metal including but not limited to bend pipes of metal, branching pipes of metal, connection pipes of metal, down pipes of metal, drain pipes of metal, drill pipes of metal, insulated pipes of metal, water pipes of metal and waste pipes of metal; reinforcing materials of metal for pipes; fittings of metal for pipes including but not limited to adaptors of metal for pipes, attachment collars of metal for pipes, cast iron parts for pipes, clamps of metal for pipes, connectors of metal for pipes, couplings of metal for pipes, ducts of metal for concealing water pipes, elbows of metal for pipes, fastening collars of metal for pipes, junctions of metal for pipes, metal T pieces for pipes, metal valves for water pipes, metal water fittings incorporating flow control parts for water pipes, racking of metal for supporting pipes and seals of metal for pipes; tubes of metal including but not limited to drawn tubes of metal, flexible tubes of metal, flexible corrugated tubes of metal, flux filled metal tubes, rigid tubes of metal, steel tubes, stainless steel tubes and strip wound tubes of metal; fittings of metal for metallic tubes including but not limited to connectors of metal for tubes, couplings of metal for tubes, fastening collars of metal for tubes, racking of metal for supporting tubes and tube plugs of metal; sheets of metal; railings of metal; rods of metal; beams of metal; conduit fittings of metal; including instructional materials sold together with the aforesaid goods, accessories, parts and fittings for all the aforesaid goods allowed in this class