Steel pipes; pipes and tubes of metal; couplings of metal for tubing; couplings of metal for tubing; pipe work of metal; [tubes of copper alloys; metal pipe clips; pipe jackets of metal; pipe muffs of metal; pipe nuts of metal; metal pipe clips; pipe work of metal; fittings of metal for pipes; pipe collars of metal; pipe support sleeves of metal; pipe extensions of metal; pipe spacers of metal; junctions of metal for pipes; pipes and tubes of metal; tubes of stainless steel; reinforcing mater...