Pipework of metal; intake manifolds of metal for pipelines; branching pipes of metal; pipes of metal; collars of metal for fastening pipes; pipe muffs of metal, including metal hose clamps; elbows of metal for pipes; clips of metal for pipes; tanks of metal for water or quenching agents for mounting in fire extinguishing apparatus and instruments; water-pipe valves of metal for fire extinguishing apparatus and instruments; interconnected pipework of metal for transporting water for use in fir...