1. Imibhobho yentsimbi yokuthuthwa kwamanzi kunye negesi (i-galvanized okanye i-non-galvanized), imibhobho yentsimbi kunye neminye imibhobho, i-diameter yepayipi kufuneka ibonakaliswe nge-DN ebizwa ngokuba yi-DN;

2. Umbhobho wentsimbi ongenamthungo, umbhobho wentsimbi odityanisiweyo (umthungo othe tye okanye ojikelezayo), umbhobho wobhedu, umbhobho wensimbi engenasici kunye neminye imibhobho, ububanzi bombhobho kufuneka bubonakaliswe ngedayamitha yangaphandle.× ubukhulu bodonga;

3. Imibhobho yekonkrithi eyomeleziweyo (okanye ikhonkrithi), imibhobho yodongwe, imibhobho yodongwe ekwaziyo ukumelana neasidi, imibhobho yethayile yesilinda kunye neminye imibhobho, idiameter yombhobho kufuneka ibonakaliswe ngedayamitha yangaphakathi d;

4. Kwimibhobho yeplastiki, ububanzi bombhobho kufuneka bubonakaliswe ngokwendlela yomgangatho wemveliso;

5. Xa uyilo lusebenzisa i-DN ye-DN ukumela ububanzi bombhobho, kufuneka kubekho itafile yokuthelekisa i-DN ye-DN kunye neenkcukacha ezihambelanayo zemveliso.