Iyo midziyo inoshandiswa kune iyi bhora vharafu ndeye upvc, ine yakasimba corrosion resistance, yakaderera fluid kuramba, uye yakakwirira simba.Chimiro chetambo yemukati chiri nyore kuunganidza uye kuparadzanisa.Chisimbiso chepamusoro chebhora uye chigaro chakaparadzaniswa kubva pakati, izvo zvisiri nyore kukonzera kuputika kwechisimbiso chekuvhara kwevhavha.