Yadlalwe ukuthi yisisekelo sesistimu sokusawula kwegazi esisha, ipaipi yegazi ye-HDPE yase-160mm SDR11 iyisikhombiso esihle kakhulu. Iyakhiwa ngokusebenzisa ipolietilini ephezulu yokwakha, ipaipi yegazi ye-HDPE yase-160mm iyaqhubeka ngendlela ephakeme futhi iyathintwa ngokungafanele ngokuphatha nokuchitha. Ipaipi ibizwa ngokukhula futhi inokuthunyelwa ngokufacile. Amaphethi amanquma okuphakama nokwakha kwepaipi kuyavumela ukuthunyelwa kwegazi ngokuphelele nokubaluleka. Ipaipi zegazi ze-HDPE esikhulayo sibonakala kakhulu ekupheleni kokuziphatha ngokuphelele kwezinhlelo zokwakha.