Xa kufikwa kumba wokulawula i-wll yemidiya kwimibhobho yamanzi yasekhaya kunye nemizi mveliso, akukho nto ibeka ivalve yebhola. Ngolwakhiwo lwayo oluhlala luhleli, le valve iyakwazi ukumelana nokunxiba kunye nokukrazula ukusetyenziswa okuqhubekayo, ukwenza ukuba kuthathe ukhetho olufanelekileyo kwabo bafuna isisombululo esithembekileyo nelide.