| 17: Reinforcing materials, not of metal, for pipes; pipe muffs, not of metal; plastic boards; plastic poles; plastic strips; watering hoses. | | 20: Valves, not of metal, other than parts of machines; drain traps (valves) of plastic; water-pipe valves of plastic; non metallic ball valves; plastic trough for cables and wires; sealing caps, not of metal; screws, not of metal. |
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