Tili ndi makina opanga opangidwa bwino kwambiri, mainjiniya odziwa bwino ntchito komanso ogwira ntchito, makina oyang'anira abwino komanso gulu lothandiza la akatswiri ogulitsa zinthu asanagule/atatha kugulitsa la Good Quality China Non Back Flow Preventer, Tikhulupirireni ndipo mudzapeza zambiri. Onetsetsani kuti mukulankhulana nafe kwaulere kuti mudziwe zambiri, tikukutsimikizirani kuti mudzalandira chithandizo chabwino nthawi zonse. Tili ndi makina opanga opangidwa bwino kwambiri...
Valavu yotchingira yotchingira yotchingira ndi mtundu wa valavu yotchingira yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana kuti ilamulire kuyenda kwa madzi. Ili ndi mpando wa raba womwe umapereka chisindikizo cholimba ndikuletsa kubwerera kwa madzi. Valavuyi idapangidwa kuti ilole madzi kuyenda mbali imodzi pomwe ikuletsa kuyenda mbali ina. Chimodzi mwazinthu zazikulu za mavavu otchingira otchingira otchingira otchingira ndi rabara ndi kuphweka kwawo. Ili ndi diski yolumikizidwa yomwe imatseguka ndikutseka kuti ilole kapena kuletsa madzi kulowa...