Kodi valavu ndi chiyani? Valavu ndi chida chamakina chomwe chimayang'anira kuthamanga ndi kukakamiza mu dongosolo kapena njira. Ndizo zomwe zimayambira paipi yoperekera madzi, gasi, nthunzi, matope, ndi zina zambiri. Perekani ma valve osiyanasiyana: valavu yampata, valavu yoyimitsa, valavu ya pulagi, ...
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