Screw Vials, Caps and Inserts for Aijiren™ Compatible Parts 1090, , HPLC/LC-MS Certified 2mL Clear Screw Vial, Marking Spot, Blue Cap, Red 2ml clear borosilicate glass screw top vial, no markings, with septa . The associated 9 mm screw caps and closures come with septa lids with a red silicone, white PTFE insert in a blue short screw thread polypropylene cap. Our 4ml Screw Thread Vials & Caps - Greenwood Products