The Altmann Analytik Filter Vial is a simple to use sample preparation system that provides a fast, effective and easy to use process by integrating a self-sampling system, a membrane and a snap-ring-cap with slit or non-slit septa. The sample is placed in the outer vial and dispensed by pressing the inner insert to push it through the membrane. The sample is then filtered and the Filter Vial is ready to be inserted into the autosampler for further processing. The filter system consists of an internal insert with a membrane chamber and an external vial. In standard the filter system includes snap-ring Caps with a silicon/PTFE septa with slit. Upon request a non-slit septa is available.