Yintoni iValve engaBuyiyo IValve engaBuyiyo (i-NRV), eyaziwa ngokuba yivalvu yokujonga, sisixhobo soomatshini esenzelwe ukuvumela ulwelo okanye igesi ukuba ihambe kwicala elinye ngelixa ithintela ukubuya kwamanzi. Iqinisekisa ukhuseleko lwenkqubo, ukusebenza kakuhle, kunye nokuthembeka ngokugcina ukuhamba kwamanzi ngakwelinye icala kwimibhobho, iimpompo,...
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