Ilaphu hydrostatic tester Umvavanyi wokufunxa amanzi Ibhafu yamanzi Isikali sombane izixhobo zokujonga inaliti Umatshini wokuqina Umvavanyi woxinzelelo lwamanzi Ivenkile yabasebenzi (1) Umvavanyi wobunzima Ivenkile yamadoda (2)