1. Omi ati gaasi gbigbe irin pipes (galvanized tabi ti kii-galvanized), simẹnti irin pipes ati awọn miiran oniho, awọn paipu opin yẹ ki o wa ni kosile nipasẹ awọn ipin iwọn ila opin DN; 2. Irin pipe paipu, irin welded (taara tabi ajija pelu), Ejò pipe, irin alagbara, irin pipe ati awọn miiran oniho, t ...
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