TY

Framework for building, not of metal; water-pipes, not of metal; water-pipe valves, not of metal or plastic; branching pipes, not of metal; rigid pipes, not of metal, for building; building materials, not of metal, namely, plastic pipe supports; drain pipes, not of metal; drain traps, namely, water-pipe valves, not of metal or plastic; penstock pipes, not of metal; plastic ducts used in construction, not for electrical circuitry