8mm Cap PTFE Silicone Seal HPLC Rubber Septa Used with 8-425 Vial. Unit Price: US $ 4.58-5.58 / Bag. Min. Order: 192 Bags. Add to Inquiry Basket. 9-425 9mm Customized Chromatography Black Cap and Rubber Septa for HPLC Vial. 9-425 9mm Customized Chromatography Black Cap and Rubber Septa for HPLC Vial.