Fun ọpọlọpọ ọdun, iwọn ila opin nla (inisi 16 ati loke) ọja pipe omi ti jẹ aṣoju nipasẹ Pipe Irin (SP), Pipe Cylindrical Concrete Precast (PCCP), Pipe Iron Ductile (DIP) ati PVC (Polyvinyl Chloride) paipu.Ni apa keji, paipu HDPE nikan ṣe iroyin fun 2% si 5 ...
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