Chromography Septas na iya zama pre-slit. A pre-slit septum zabi ne na dacewa a aikace-aikacen da ke buƙatar 20% ko fiye na allurar samfurin kowane lokaci daga Viiyatus don an guji tsotse. The Slit yana ba da damar gas na yanayi don daidaita gas a cikin Vial don ba a ƙirƙira waƙoƙi a cikin m hatimi daga allon da ke kusa da allura. Idan cring ko clogging daga kunkuntar allura ko allura ƙayyadadden daga m m teppta abu abu abu ne mai damuwa, sannan zabar septum pre-sepit ne mafi kyau zaɓi.
PTFone na PTFE \ / silicone tare da Sepicone Septored yana ba da damar sauƙin Conetration da kuma don sakin barcin wannan siffofin yana cire daga babban samfurin. Wannan Septum tana ba da halaye na choomitographic kama da na septum banda slit sai dai wancan ikon yin tsayayya da fuskantar matsalar rashin ƙarfi an ɗan rage. An ba da shawarar pre-slit septa sosai don inganta daidaitaccen rashin daidaituwa tare da autosamplers repial fiye da 50μl na samfurin daga vial 2ml vial, saboda yiwuwar cavitation (copuum).