Isingeniso: Ama-valve okuzenzakalelayo we-flush anikeza ukulula, ukusebenza kahle, nenhlanzeko emkhakheni wehadiwe lokugezela kanye nemidlalo. Kulo mhlahlandlela, sihlola umhlaba wama-valve okuzenzakalelayo, ehlose ukusiza ochwepheshe embonini yokwakha nezinto zokuhlobisa ukuqonda kangcono ukufaneleka kwabo nezinzuzo zabo. Ngaphandle kokunye okuqhubekayo, ake sicwilise kumqondo wama-valve we-flush azenzakalelayo. 1