common use EPA vials with septa and screw cap. Certified chromatography vial septa with PP caps-Aijiren HPLC. common use gas chromatography vials pp caps Aijiren. Standard Opening 2ml HPLC Vial Screw Neck Autosampler Vial With Pp Cap Online-Aijiren 2ml Sample Vials. Screw Neck Sample Vial Cap ...