8. Septa are made of the highest quality materials to ensure proper function and can be pre-slit to ease needle penetration. Application. 8-425 screw thread caps and vials are suitable for Aijiren, AB Sciex, Brukers, Techcomp, PerkinElmer, ThermoScientifics, Shimadzu, Waters, CTC autosampler and other rotating or robotic arm samplers and