Yenziwe ngensimbi engagqwali engu-304 engcono kakhulu, ingaqinisekisa ukuthi akukho ukugqwala, ngeke kukhiqize ukungcola,
ngeke ivinjwe, ibe nempilo ende yesevisi, ngeke ivalwe inzika.
Isimiso
1. Insimbi engagqwali, i-anti-corrosion, ihlinzeka ngamanzi ahlanzekile.
2. Ukupakisha komuntu ngamunye noma ukupakisha ngobuningi kuyamukeleka.
3. Idizayini ilungele izingulube kanye nokunikezwa kwamanzi okuthuthwa kwendle.
4. Isihlungi sepulasitiki esilungisekayo kulula ukushintsha izinhlelo zamanzi ezicindezelayo kanye nezinhlelo zamanzi ezicindezelayo.