Ukuxhumeka kwe-drainpipe ye-HDPE kufanele kudlule ekulungiseleleni impahla, ukusika, ukushisa, ukuncibilika kwe-butt welding, ukupholisa nezinye izinyathelo, izici eziyinhloko zokusebenza kahle komzimba, ukumelana nokugqwala okuhle, ukuqina, ukuguquguquka, isingeniso esilandelayo esilandelayo...
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