Hakanan ana kiran tsarin tattara ƙurar tsakiya na tsakiya.Ya ƙunshi masaukin mai tsabtace iska, bututu mai ƙura, soket, da abin da ba a taɓa gani ba.Ana sanya mai masaukin baki a waje ko a cikin dakin injin, baranda, gareji, da dakin kayan aiki na ginin.Babban naúrar an haɗa shi da soket ɗin injin kowane ɗaki ta cikin bututun injin da aka saka a bango.Lokacin da aka haɗa shi da bango, kawai soket ɗin mai girman girman soket ɗin wutar lantarki kawai ya rage, kuma ana amfani da bututu mai tsayi don tsaftacewa.Saka soket ɗin tsotsa ƙura, ƙura, tarkacen takarda, ɓangarorin sigari, tarkace da iskar gas masu cutarwa za su bi ta cikin bututun da aka rufe sosai don tsotsa ƙura a cikin jakar shara na injin tsabtace injin.Kowa na iya yin cikakken tsaftacewa ko wani bangare a kowane lokaci.Aikin yana da sauƙi kuma mai dacewa, yana guje wa gurɓataccen gurɓataccen abu da gurɓataccen hayaniya da ƙura ke haifarwa, da kuma tabbatar da tsabtace gida mai tsabta.