1. Lipeipi tsa tšepe tsa lipalangoang tsa metsi le khase (tse nang le galvanized kapa tse se nang galvanized), liphaephe tsa tšepe tse entsoeng ka tšepe le liphaephe tse ling, bophara ba phala bo lokela ho hlalosoa ka bophara ba DN;

2. Pipe ea tšepe e se nang seam, phala ea tšepe e entsoeng ka tšepe (seame se otlolohileng kapa se otlolohileng), phala ea koporo, phala ea tšepe e sa hloekang le liphaephe tse ling, bophara ba phala bo lokela ho hlahisoa ka bophara ba kantle.× botenya ba lebota;

3. Liphaephe tsa konkreite tse matlafalitsoeng (kapa tsa konkreite), liphaephe tsa letsopa, liphaephe tsa ceramic tse hanyetsanang le asiti, liphaephe tsa lithaele tsa silinda le liphaephe tse ling, bophara ba phala bo lokela ho hlahisoa ka bophara bo ka hare d;

4. Bakeng sa liphaephe tsa polasetiki, bophara ba pipe e lokela ho hlalosoa ho ea ka mokhoa oa lihlahisoa tsa lihlahisoa;

5. Ha moralo o sebelisa bophara ba lebitso la DN ho emela bophara ba phala, ho lokela ho ba le tafole ea papiso ea bophara ba lebitso la DN le litlhaloso tse lumellanang tsa sehlahisoa.