wholesales flat bottom gas chromatography vials metal cap Compatible with ND 20 mm PTFE Silicone Septa Aluminium Crimp Cap Cat. No. Description Pack Size V02005CUCF0 5 mL, GC/Headspace 20 mm, Crimp Neck, Flat Bottom, Clear Glass Vials 100 V02010CUCF0 10 mL, GC/Headspace 20 mm, Crimp Neck, Flat Bottom, Clear Glass Vials 100 V02020CUCF0 20 mL, GC/Headspace 20 mm, Crimp Neck, Flat Bottom