Common metals and their alloys; metal building materials, namely, metal fittings, namely, press-connect fittings used to securely join sections of pipe in plumbing, process and mechanical systems, metal nipples, metal thread tape used to securely join sections of pipe in plumbing, process and mechanical systems, metal flanges, metal valves, other than parts of machines, metal tape used to securely join sections of pipe in plumbing, process and mechanical systems; transportable buildings of me...