Izinto ezisetyenziselwa le valve yebhola yi-upvc, enokumelana ne-corrosion eyomeleleyo, ukumelana nolwelo oluphantsi, kunye namandla aphezulu.Ubume bomsonto wangaphakathi kulula ukudibanisa kunye nokuqhaqha.Indawo yokutywinwa kwebhola kunye nesihlalo sihlukaniswe phakathi, okungekho lula ukubangela ukukhukuliseka kwendawo yokutywinwa kwevalve.