S312, 02S404 umkhono oguquguqukayo kwaye oqinileyo ongenamanzi
I-S312, i-02S404 imikhono engangeni manzi isetyenziswa ikakhulu phantsi kweemeko zokusebenza apho kukho ukungcangcazela okanye imfuneko engqongqo engenamanzi kwindawo apho umbhobho udlula eludongeni. Kwelinye icala, kukulungele ukufakela kunye nokususwa kwemibhobho, kunye ne-anti seepage kunye ne-anti leakage; kwelinye icala, Ikwakhusela izakhiwo kumonakalo owenziwe ngamanzi kunye nokungcangcazela.