There’s a Aijiren Tech vial & closure for every HPLC, GC, MS instrument, application, and budget. Screw Vials, Caps, Septa, Inserts & Kits. SureStop Vials and AVCS Caps | Aijiren Tech Scientific – UK SureStop vials are designed as part of the Advance Vial Closure System (AVCS) and remove any subjectivity around achieving the optimal