Fittings of metal for compressed air hoses; Fittings of metal for compressed air lines; Fittings of metal for flexible pipes; Metal fittings for compressed air lines; Metal fittings for flexible pipes; Metal hardware, namely, nuts; Metal pipe connectors; Metal pipe couplings and joints; Metal pipe fittings; Metal pipe fittings for compressed air pipes; Metal pipes and metal fittings therefor; Metal plugs; Pipe coupling of metal; Pipe couplings of metal; Couplings of metal for pipes; Pipe coup...