USA 10mm septa closure for snap vial-Aijiren HPLC Vials 11mm Snap Neck Closures for Sale--Aijiren Vials for HPLC/GC 11mm Snap Closures are an extension of the crimp cap sealing system. Stretch the plastic cover on the edge of the 11mm Snap Vial, and form a seal by squeezing the Septa between the glass and the PP Cap.