Common metals and their alloys; metal building materials; stormwater detention chambers; metal components for stormwater detention systems; pipes and tubes of metal; drain pipes; drain traps of metal and pipework; but excluding such goods which convey or hold water for flushing; all the aforementioned goods being included in this class

Building materials (non-metallic); non-metallic rigid pipes for building; drain pipes and tubes not of metal; drain traps (valves) not of metal or plastic; stormwater detention chambers not of metal; non-metallic components for stormwater detention systems and pipework not of metal; but excluding such goods which convey or hold water for flushing