Aijiren Certified Vials, Caps and Septa - Postnova. Blue polypropylene cap, bonded pre-slit PTFE/silicone septa. 100/pk 5185-5824 Certified Flat Bottom Headspace Crimp Top Glass Vials. 20 mL, 23 x 75 mm. Chromacol - Cromlab. GC Septa. 56. Prime Chromatography Data Handling. 57. Syringe Filters 2mL, clear glass, crimp top, flat bottom, wide neck