screw cap supplier for HPLC Vials Waters-Aijiren 2ml Waters Certified vials are tested for cleanliness by HPLC and held to tightest dimensional tolerances in the industry. LCGC Certified Clear Glass 12 x 32 mm Screw Neck Vial, Total Recovery, with Cap and Preslit PTFE/Silicone Septum, 1 mL Volume, 100/pk - 186000385C : Waters