13mm Screw Autosampler Vial. The size of the 4ml autosampler sample vial is 15x45mm, with 13-425 GPI threads, and can hold up to 4ml samples. Sample vials are preferentially used for instruments of the following manufacturers: Rated 4.7 /5 based on 420 customer reviews. 13mm screw vial 4ml hplc vial 4ml screw vial. Free Sample Get Price. 9-425