snap vial for hplc with cap Perkin Elmer-Aijiren Vials for HPLC To purchase 2ml hplc vial with cap, please choose Aijiren. Aijiren High Quality 8-425 2ml HPLC Vial with Cap for Sale Screw-top vials also come in different sizes, with vial caps made of either aluminum for crimp seals or plastic.