Jul 31, 2020 · Despite the slit, Septa is also able to maintain the sample seal in HPLC Vial without creating a vacuum in the air pressure inside the HPLC Vial when sampling the auto-injection needle. Aijiren offers two types of pre-slit Septa, single slit and cross slit, such a slit can guide the injection needle accurately punctured Septa into the HPLC Vials, without a thin automatic injection broken, or the cushion falls off into the HPLC Vial contaminated sample.