4ml Chromatogrphy Screw Neck Vial on Sale. Aijiren’s 15x45mm 4ml Chromatogrphy Vials have 13-425 GPI threads and can hold up to 4ml samples. Use 13 x 425 bottle caps with septa for sample vials, and use diffusion caps for rinse bottles. These vials have a closed top screw seal and can also be used as.