Aijiren hplc vial with insert for 2ml clear vials-Aijiren The 2ml glass hplc vials provided by Aijiren has three different calibers, screw top, snap top and crimp top. Among them, Glass Vial with Crimp Caps is welcomed by customers because of its good sealing performance, and Crimp top glass vial has good sealing performance to hold gas samples.