Jun 09, 2021 · China Mercedes Shape Pre-slit Septa for HPLC vials Manufacturers, Suppliers and Factory ① Compatible for short neck ND9 vials (12*32mm) most common used for HPLC/GC. ② Ribbed cap makes it easier for autosampler to capture. ③ Y shape pre-slt is special for thin or blunt needle while injection, and can also avoid bubble during penetration.