High Quality, Lowest Priced, HPLC & GC Syringe Filters in the UK. High Quality HPLC & GC Autosampler Vials. Request information. Nov 24 2020. Competitively priced, high quality, HPLC & GC Autosampler Vials, caps and septa are now available from the UK’s latest Chromatography consumables company, HPLC Direct Ltd.