Standard Opening borosil laboratory vials with ptfe liner pp cap for HPLC and GC Chromatography Vial Closures|laboratory vials supplier DescriptionBlue polypropylene screwthread closure,18mm,with PTFE/silicone liner. 100 per pack. ,89047-696PK,97035-460PK,89047-704PK Caps for Screw Top Vials,Aijiren